I just fought General Grell and it was a longer than normal fight. His minions kept respawning during the fight. What makes the minions spawn?
Is it timed? Say, every 30 seconds a new wave comes
Is it based on the percent of the damage done to the boss? Every X percent a new wave comes?
Is it based on the number of minions left to left? IF the number of minions alive drops to say, less than 4, it spawns new minions?