how do you easily kill the bulet? I have to avoid that thing at all costs
The Spell Command: Halt is amazing against the Bulette. Its a wisdom saving throw DC 13 or 14 and the Bulette has no proficiency in Wisdom so it has to roll a 13/14 or higher to resist it.
By the way, Bulette is pronounced Bul-lay.
Buuuu-lay...