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Skill Point

In SAS: Zombie Assault 4, the player earns a skill point to spend on skills every level when leveling up. Upon creating a new character, that character will automatically have one skill point into its first class skill. Originally only a maximum of 100 skill points could be obtained. However, with the addition of Augmentation Rewards, added on the February 3rd, 2015 update, an additional eight can be earned.

Players can only spend up to 25 skill points in a single skill.

General Skills

These are skills available to all classes.

Skill Logo Skill Description Initial Max Growth Related Achievements
Fast Reload
Fast Reload-Mobile

Fast Reload

Decrease reload time

3.5% 58.96% reload speed increased by 100*(1-0.965^levels)%

See notes for stacking

Growth chart
Quicksilver
Reload time skill growth chart sasza4
Fast Movement
Fast Movement-Mobile

Fast Movement

Increase movement speed

+3% +39% +1.5% move speed / level Quicksilver
Toughness
Toughness-Mobile

Toughness

Increase max HP

+300 Max HP +7500 Max HP

+300 Max HP / level

Augment stacks multiplicative

Tank
Recovery Time
Recovery Time-Mobile

Recovery Time

Reduce your recovery time when knocked down in multiplayer games

10% 130%

5% / level

See notes for stacking

none
Health Regen
Health Regen-Mobile

Health Regen

Passively regenerates your health over time

+2.5 HP/sec +62.5 HP/sec +2.5 HP/sec regen per level Regenerator
Pay Grade
Pay Grade-Mobile

Pay Grade

Increase the end of mission cash reward. Affects failed mission cash reward as well.

+12.5 % 312.5% +12.5% cash reward / level none
Body Armour Expert
Body Armour Expert-Mobile

Body Armour Expert

Increase the total resistance for all armour worn

7% +175%

+7% / level

Tank
Energy Boost
Energy Boost-Mobile

Energy Boost

Increase max energy

+10 max energy point +250 max energy point +10 max energy point / level none
Energy Regen
Energy Regen-Mobile

Energy Regen

Increase the amount of energy regenerated per seconds

+0.25 +6.25 +0.25 point / sec regen per level Regenerator
Field Supplies
Field Supplies-Mobile

Field Supplies

Get extra premium ammo for current active gun used whenever you pick up any loot (Maxed at 100 per loot)

15% of clip size 375% of clip size

+15% clip size / level

Rounded up

none
Grenade Damage
Grenade Damage-Mobile

Grenade Damage

Grenade do extra damage

+15% damage +375% damage

+15% damage / level

none
Critical Shot
Critical Shot-Mobile

Critical Shot

Chance per shot to do more damage (base crit damage is +100% without any level)

Chance +4% , Damage +105% on crit rather than +100% Chance +16%, Damage +201% on crit rather than +100% +0.5% chance & +4% crit bonus damage / level

See notes for Critical Damage stacking

none

Notes

  • For reload speed, the number stacks multiplicative with base reload speed first, then other multiplier augments or other reload speed effects. For example a gun with 2 seconds with reload speed 50% from skill +  25% reload speed from nimble augment + 50% from Adrenaline will results in calculation of 2 x (1-0.5) x (1-0.25) x (1-0.5) = 0.375 sec reload time instead of instant reload. Titan IDS arm and nimble augment stacks additively as one multiplier.
  • For recovery speed, the calculation: base recovery time / (1 + (1 x recovery skill multiplier) + 0.25 if rubicon equipped + (1 x total percentage of resuscitating augment)) = current recovery time, if a nearby medic exists with speed up recovery aura, it will further reduce current recovery time / 1+(1 x medic skill multiplier)
  • For the Body Armour Expert skill, the multiplier is applied to both the armour's base resistances AND augmented bonus resistances.
  • The damage reduction formula:
    sqrt((total displayed resistance BASE number x (1 + Body Armour Expert skill multiplier)) + total of augment bonus + total of mastery bonus + medic aura if exist ) = actual damage reduction.
    For heavy class, the left over percentage is then reduced again by Toughbody if exists or Die Another Day skill if activated. For example 30% damage reduction from armor would result for level 25 Toughbody which have 56% damage reduction to be only effectively only (70% left over x 0.56 ) = 39.2% added value for end total of 69.2% damage reduction.
  • Critical Damage increases the damage multiplicatively from the displayed number of damage of the gun used only. For example with head augment which increase damage for 15% and critical hit 25 (+200% crit damage ) will make the gun does a total of 315% damage from 100% base + 15% + 200% crit instead 345% from (100% base + 15%) * 300% on critical hits. Please also know that Critical hits, like other additional damage buff, does not increases DoT damage caused by the gun nor damage from active skills.

Assault Class Skills

Skill Logo Skill Description Initial Max Growth Related Achievements
Adrenaline
Adrenaline-Mobile

Adrenaline

Increase movement, firing and reload speed for short duration (20 energy cost, 25 sec cooldown)

+25% move speed, rps and reload speed for 5 seconds +53.82% faster for 11.0 seconds

speed = 100*(1-0.75*0.98^(levels-1))%

(Average of 1.17% / level)

+0.25 sec duration / level

see notes

none
Deadly Force
Deadly Force-Mobile

Deadly Force

Increase global gun damage

+1% gun damage +25% gun damage

+1% gun damage / level

see notes for mobile version stacking

none
Close Quarters Combat
Close Quarters Combat-Mobile

Close Quarters Combat

Slash knife to enemies entering skill range (10 energy cost, 0 second cooldown)

+750 damage with 45' arc and 1m range +5550 damage with 93' arc and 2.2m range

+200 damage, +2 arc, + 0.05m range / level

see notes

Pistol Whipped
Gun Mod Expert
Gun Mod Expert-Mobile

Gun Mod Expert

Decrease gun augmentation cost, increase augmentation reward xp

5% reduced cost, +10% aug xp 48.26% reduced cost, +250% aug xp

+(4-0.16*(level-1)%, +10% aug xp / level

none
Stim Shot
Stim Shot-Mobile

Stim Shot

Heals when health is below 20% (120 seconds cooldown)

15% HP/sec for 2 seconds, 34 energy cost 21% HP/sec for 4.4 seconds, 10 energy cost

+0.25% HP/sec, +0.1 sec duration, -1 energy cost per level

none
Killing Spree
Killing Spree-Mobile

Killing Spree

Kill 20 zombies to activate increased damage and pierce. Keep killing to refresh duration

+30% damage and pierce for 2 seconds +150% damage and pierce, lasts 4.4 seconds

+5% effect, +0.1 sec duration

none
Assault Team
Assault Team-Mobile

Assault Team

Calls in an assault team to your position (60 energy cost, 120 seconds cooldown)

15 sec duration, 3 sas team, 10% damage, 1500 HP 63 sec duration, 4 sas team, 250% damage, 13500HP

+2 sec duration, +10% damage, +500 HP / level. +1 sas team on level 20

see notes

Field Commander

Notes

  • Adrenaline skill's RPS and reload speed stacks multiplicative, move speed stacks additionally.
  • Mobile version's Deadly force, along with others passive damage buffs, does not stacks multiplicative with Deadly augments and stacks as additionally instead. It is unknown whether if one version displayed number is a bug and actually using same mechanics like the other version or versa or actually each version have different game mechanics. Deeper research required
  • Close Quarter Combat has slashing animation for 0.X seconds depending on the level, which player can move (free backpedalling speed) and any enemy caught in the area will still be damaged thus extending the attack area. During this animation however, some gun could not be fired means player have to be careful when using it.
  • Only one assault team can be called at one time. In newer version, it might be possible to call multiple at once.
  • The assault team members use HVM Assault rifle, shotgun and MPG rocket launcher on random order. They only have pierce of 1 except for rocket launcher and the damage dealt is "n" percentage of the mentioned weapons, they also have same ammo capacity and requires reload. They also do not damaged by acid blood death pool or spitter and regurgitator (left over) acid pool.

Medic Class Skills

Skill Logo Skill Description Initial Max Growth Related Achievements
Medkit
Medkit-Mobile

Medkit

Drops a field medkit that heals any SAS who pick it up (45 energy cost, 4 sec cooldown)

heals 400 health heals 4000 health

+150 heal per level

none
Protective Aura
Protective Aura-Mobile

Protective Aura

Increases the thermal and chemical armor value for player and nearby allies (passive)

2m radius, +75 armor 4.4m radius, +1875 armor

+0.1m radius, +75 armor per level

none
Revive
Revive-Mobile

Revive

Boosts revive time and health of nearby fallen teammate (passive, active when 1m or closer to fallen teammate) health boost is % of revived player's maximum health

+18% speed, +5% health +150% speed, +125% health

+5.5% speed, +5% health per level

none
Biocleanse Bomb
Biocleanse Bomb-Mobile

Biocleanse Bomb

Slows zombies by 50% and lowers their resistance by 50% when in blast radius (20 energy cost, 5 sec cooldown)

2m blast radius, 3 sec duration 4.4m blast radius, 15 sec duration

+0.1m blast radius, +0.5 sec duration per level

Cleanup on Aisle 13
Bad Blood
Bad Blood-Mobile

Bad Blood

Melee attackers take damage every time they strike you (passive)

40 damage to melee attacker 1000 damage to melee attacker

+40 damage per level

none
Final Farewell
Final Farewell-Mobile

Final Farewell

When you go down you heal everyone around you and drop medkits (active when player goes down, no cooldown*)

3.5m heal radius, 40% heal, 4 medkits 8.3m heal radius, 112% heal, 11 medkits

+0.2m heal radius, +3% heal per level. +1 medkit every 3 levels

none
Zombie Antidote
Zombie Antidote-Mobile

Zombie Antidote

Huge gaseous explosion of virus antidote does large damage to zombies in the radius (80 energy cost, 60 sec cooldown)

2m blast radius, 6000 toxic damage over 8 seconds 4.4m blast radius, 150000 toxic damage over 32 seconds

+0.1m blast radius, +1 sec duration, +6000 total damage spread over duration per level

Zombie Heal Thyself

Notes

  • Medic's dropped Medkit lasts for 15 seconds before it disappears. Unlike the normal Medkit drop which is permanent. In mobile version, the dropped Medkit cannot be moved by a player but can be pushed by moving an object through it.
  • Biocleanse Bomb stacks by multiplying with gun adaptive augment.
  • Protective Aura is not affected by Body Armor Expert.
  • Final Farewell is stated to have 150 seconds cooldown. This is false information actually just to prevent the state-check activated repeatedly, avoiding the bug which allows a dead player to get Final Farewell activated multiple times in single recovery period.
  • The number of extra HP gained through Revive is relevant to how long the medic stays with the fallen.

Heavy Class Skills

Skill Logo Skill Description Initial Max Growth Related Achievements
Hold The Line
Hold The Line-Mobile

Hold The Line

While standing still, increases your damage and weapon penetration for a short time (30 energy cost, 30 sec cooldown)

8 sec duration, +30% damage and pierce 27.20 sec duration, +126% damage and pierce

+0.8 sec, +4% damage&pierce per level

none
Heavy Gear
Heavy Gear-Mobile

Heavy Gear

Reduces percentage of negative movement effects for weapons and armor (passive)

-10% movement penalty -100% movement penalty

-3.75% per level

none
Tough Body
Tough Body-Mobile

Tough Body

You are so tough you are more resistant to damage than normal (resists Dark Minion zombies' attacks) (passive)

6% damage reduction 54% damage reduction

+2% per level

none
Die Another Day
Die Another Day-Mobile

Die Another Day

Become 90% immune to damage for a short time (39 energy cost, 50 sec cooldown)

90% immunity for 4 sec 90% immunity for 10 sec

+0.25 sec per level

Not Today
Brute Strength
Brute Strength-Mobile

Brute Strength

Your brute strength allows you push through obstacles and damage enemies in your path (passive)

+50% push force, 30 damage to zombies +530% push force, 750 damage to zombies

+20% push force, +30 damage per level

none
Cuncussion
Concussion-Mobile

Concussion

Your shots have a chance to stun enemies (passive)

5% chance, 0.5 sec stun 17% chance, 1.7 sec stun +0.5% chance, +0.05 sec per level
Only applies on player's guns' projectiles, including bullets, rockets, lasers, blades, and flames. The chance depends of number of fletchettes, making multi-fletchette weapons ideal with this skill.
none
Aerial Bombardment-PC
Aerial Bombardment-Mobile

Aerial Bombardment

Powerful orbital strike deals huge damage in a targeted area (60 energy cost, 90 sec cooldown)

6 blasts, 2000 damage each, 4m blast radius per blast 14 blasts, 32000 damage each, 4m blast radius per blast

+1 blast every 3 levels; +250 damage per level

Zombies Go Boom

Notes

  • Hold the Line effect stays active when the player pushed by forced movement such as zombies or other players.
  • Heavy Gear is counted before Masteries and Collection Rewards when calculating movement penalties.
  • Tough Body vs. Toughness, which will help you live longer?
    Toughness is better before level 48, after level 48 Base Health is high enough that maxing Tough Body becomes more important.

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