Biological units are StarCraft and StarCraft II units that consist primarily of non-mechanical components.

All zerg units and structures are biological and can self-heal.


Biological units are vulnerable to a wide array of effects, such as a science vessel's Irradiate ability and the queen's Spawn Broodling ability. However, they are immune to effects such as the ghost's lockdown ability.

They include all zerg units, terran SCVs (also counted as mechanical), marines, firebats, ghosts and medics, and protoss zealots, high templar, and dark templar.

StarCraft IIEdit

The science vessel's Irradiate can still damage anything that is biological and the queen, medivac dropship, and medic can heal anything biological. The archon and the spore crawler does bonus damage to biological units.

Units in Starcraft II are tagged with one or more Attributes that determine bonus damage, affect targeting, and/or can influence spells and abilities.

List of Biological unitsEdit

The Biological units, categorized by race, are listed below.


Units with Bonus Damage Against BiologicalEdit


Negative Spells and AbilitiesEdit

This is a list of harmful spells and abilities that can only affect units with the attribute of Biological.

Snipe SC2 Icon1
Steady Targeting

After carefully aiming for 1.43 seconds while not taking damage, the Ghost fires a sniper round dealing 170 damage. Ignores armor. Can only target biological units.

Hotkey R
Cost 50 Energy Terran SC1
Range 10
Cooldown 1.43Time SC2 Game1
Purchased from Already researched

Positive Spells and AbilitiesEdit

This is a list of beneficial spells and abilities that can only affect units with the attribute of Biological.

Transfusion SC2 Icon1

The queen instantly restores 75 hit points to target biological unit or structure, plus an additional 50 health over the next 7.14 seconds.

Hotkey T
Cost 50 Energy Terran SC1
Cooldown 1Time SC2 Game1

The medivac dropship heals a friendly biological unit nearby it.

Can be set to autocast. May only be cast on one unit as a time, and may not be stacked by multiple medivacs.

The ability does not "stack" with a roach's fast healing rate.[1]

Medivac dropships cannot heal units inside of them.

Hotkey E
Cost 1 (per 4 hit points healed) Energy Terran SC1
Range 4


  1. Karune. 2009-02-18. StarCraft II Q&A - Batch 49. StarCraft II General Discussion Forum. Accessed 2009-02-18.
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