The issue isn't gear or DPS for me.... I have 270 gear and I can causually kill the mandelorians in 1 - 2 ability hits.... I also dwindle down the bosses health at an average rate.... The issue with this boss fight is his damn hitbox! Whenever he spawns in the mandelorians it's nearly impossible to hit them, because they go inside the bosses hitbox forcing the character to automatically hit the boss and switch targets CONSTANTLY.... This becomes especially a big issue later on in the boss fight when you have like 4+ mandelorians shielded by the bosses hitbox 😑. The Hitbox is the biggest issue with this boss NOT the gear or DPS TBH!

Just set companion on heal and try to keep gemeni agro'd on you as much as possible.... If you keep her agro'd on you while she uses her special your companion won't die and the heals will be enough to keep you alive.... Then just rinse and repeat. That is how you beat this fight the easiest