Every 4 rounds you "go" back in time. All traps, shields, and anything else on the boss is removed. The boss recovers the amount of health he had 4 rounds ago. The players don't lose there blades, shields, or enemy traps. The boss has 50,000 health and if someone joins in late the boss gets +10,000 health per person (if three people join in late or die and come back, the boss would have 50,000 minus the damage done plus 30,000 to max health) If health goes over 100,000 it goes back down to 50,000 but you have to fight him twice (like shadow malistare) and so on.