A bug involving Beastmaster has been discovered in Dota 2 that grants a permanent health bonus to lane creeps

How do you give all allied lane creeps +250 HP and +15 movement speed?

n3ePavliK_ noticed an interesting moment in the replay of the match between Yellow Submarine and Zero Tenacity: [Beastmaster] picked up the [Rune of Illusions] and soon disconnected from the game. After he returned, the allied lane creeps gained +250 HP and retained the bonus until the end of the match.

I helped figure out the cause. The bug affects both talents, although only the health talent was tested in that match.

What’s happening behind the scenes?

Both talents work through global auras. Normally, Beastmaster himself and his creatures should receive their bonuses, but there’s a bug in the check to determine which player they belong to.

When the game disconnects, it loses the link between [Beastmaster] and his illusions and the player. Upon reconnection, this link is restored for the hero himself, but not for the copies that have already been created.

To grant the bonus, the aura checks whether the copy and the specific creature belong to the same player. The illusion no longer has a designated player. A regular linear creep does not have this binding to begin with. The check mistakenly treats this as a match—and the creep receives the buff.

But why does the bonus remain after the illusions disappear?

The illusion disappears from the screen but remains in the game’s memory for reuse. The auras of these talents continue to function even after the copy dies—which is why it keeps buffing creeps, including new waves. <...>