system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40k] What would happen if a massive fleet of Tyranids flew directly into the eye of terror?
gpt
Near-endless battle.

The Chaos forces would rapidly replenish their numbers with undying daemons. The Tyranid forces would rapidly replenish their numbers from the biomass of the slain (discounting daemons) as there is material biomass in the Eye of Terror.

Eventually, the Tyranids would lose if they fought it out as daemons can never truly be destroyed and there is only a finite amount of biomass in the Eye. However, if they managed to consume all the biomass in the Eye of Terror they might actually emerge stronger than ever, having adapted to becoming all but immune to the corruption of the Warp.

So best case scenario: 'Nids all die, weakening the Renegades as they do.

Worst case scenario: 'Nids destroy every Renegade in the Eye of Terror, but emerge stronger than ever.