If they have a phantom for a boss, why not an enemy kraken or lich or maybe even bring the scarab. I don’t care which one it is but I want at least one of those.
Scarab would be great.
Also because in halo 2 Sgt. Johnson states that " we’ve all run the simulations, they tough but they ain’t invincible." Talking about the scarab and he says “simulations”
I say a super giant deacon pipap or Warden Eternal