Unlike other Goblins that can be talked out of fighting through ability checks or cowed by a Drow player character, Gresh will always be hostile after a brief conversation. He will ridicule Sazza as a failure if she is with the party.
Normal weapon damage + Superiority DieWeapon damage
Spend a superiority die to deal Weapon Damage + 1d8 Physical damage and possibly Frighten the target.