v1.5:

Removed the special one-shot protection against Offense Drones as it unintentionally devalued the health bonuses.

Fixed Giant Boomers' explosive melee attack inflicting self damage to themselves.

Reduced the difficulty of Threat 2 as it was larger jump in difficulty from the previous Threat level than intended.

Added Threat 3.

v1.4:

Added a warning before the immediate termination for igniting teammates with a flamer.

v1.3:

Offense Drones can no longer one-shot any marines via their increased damage, unless they already can without the damage bonus.

Any attempts to ignite teammates with a Flamer would now lead to the attacker's immediate termination.

v1.2:

Added a visual effect for Grappler Rangers' projectiles to make it easier to distinguish them from normal Ranger projectiles.

Minor adjustment to Threat 2 spawn rules.

v1.1:

Reduced how vulnerable Grapple Rangers are to explosive damage.

Addon is now considered complete enough to be fully released.

v1.0:

Added new alien type: Grapple Rangers.

Adjusted how the script look for Giant Boomers' bombs so they can still work after the Giant Boomers they spawned from have died.

Beta v2.2:

Support Drones can no longer buff any aliens if they are fully frozen.

Support Drones' buff range is halved if they do not have direct line of sight on their buff target.

Giant Boomers' explosive melee attack can now also damage other aliens.

Added back Giant Boomers' 50% explosive damage resistance.

Overhauled how map-spawned aliens receive possible mutation, as an attempt to fix the bug where an alien can receive two mutations at once (the entities get confused with what to do).

Changed the Tier 2 variant's name to Threat 2.
It sounded too similar to Difficulty Tier 2, which has nothing to do with this challenge.

Beta v2.1:

Reduced Giant Boomers' melee damage.

Giant Boomers' explosive melee attack can now ignite their victims for a short period of time.

Reduced Support Drones' maximum health.

Added Tier 2 variants.

Added Carnage 2 variants.

Added Weapon Balancing variants.

Added a Single Player variant.

Attempt to fix a bug where a drone can receive multiple visual mutation, making it a lot more confusing on what mutation they have. (In reality, they just have one mutation overriding another)

Beta v2.0:

Offense Drones now apply stun to their targets.

Increased the resistances granted by Support Drones' buff.

Offense Drones and Defense Drones now have particle effect indicators to make them more distinguishable.

Significantly reduced the health of Giant Boomers.

Slightly reduced Giant Boomers' melee attack's explosive radius.

Removed Giant Boomers' explosive resistance.

Giant Boomers' melee attack now has visual effects to make it more clear that it deals explosive damage.

Giant Boomers' bombs now have a more distinguishable visual effect.

Slightly adjusted spawn rules.

Fixed some bugs involving Support Drones' buff.