ninja pepe

1)stand one dodge away from tank
2) auto attack till hov locks on the core (5th hit gets you like ONE WHOLE BAR so keep this in mind)
3) maintain optimal distance (one dodge away) as you keep barraging the core
4) for the last health bar try to reserve keys active so the splash damage core your explosion + keys hopefully instagib it. Ironically when it does open its core on the last phase it doesn't take as much damage as splash on a closed core does