v3.1:

Added Singleplayer mode: ASBI spawn rules are no longer enforced. Item drop chance halved.

v3.0:

Added sound cues for item drops.

Every item drop now decreases the chance of the next item drop, at a rate that is affected by the player count.

v2.5:

Common Assault Jets now provide increased damage against large aliens instead of elite enemies, as the latter overlaps with another item's purpose.

v2.4:

Re-added Shieldbugs and Antlionguards as possible alien type summons, but with lower chance.

The Boss no longer takes friendly fire from other aliens.

Added healthbar support for ghost alien allies.

Replaced "rd_auto_kick_low_level_player 1" with "rd_auto_kick_low_level_player_if_brutal_or_challenge 1" due to the former not working as intended.

v2.3:

Shieldbugs can no longer be summoned by the Boss.

v2.2:

"rd_auto_kick_low_level_player" has now been set to 1.

v2.1:

Fixed aliens pre-placed by the map not having health bars.

v2.0:

Added health bars for all aliens.

Removed several possible alien types the Boss can summon.

Dropped items now drop in random angles.

Dropped welders now drop with their sides facing down.

v1.4:

The Boss's summon strikes will now only summon aliens if the strike did not hit anyone.

v1.3:

Attempt to fix the bug where queen and the Boss can be spawned through the ground and noclip into the void.