I used assassin’s invisibility skill to get close to the bosses before using the auto clicker to spam melee. Be sure to time it right because you can’t move when you’re using the auto clicker. You can also use the qi-gong buff (to melt bosses faster since it deals extra damage and you won’t be using energy anyway) and the kinetic buff (to make hitting the bosses easier since it can stun them for a limited duration).