You just think there weak cause of the low health.but trust me,they have good attack and use rank 7 spells.there are bosses with more health then malistare,and certainly stronger then malistare too. A lot of wizards think a lot of people are stromg because of there health.wrong. its cause of there attack. its just like the same thing with ice wizards. They have a lot of health,but weak attack. So if you see a boss with low health in celestia then dont consider them weak. consider them like storm wizards,low defenses, but good attack.
The last boss, Mithraya, is rank 11. Don't say they're weak because they have low health. Celestian bosses have awesome criticals, blocks, power pips ratings, and spells. To top it all off, they start with 2-6 power pips and many of them cheat. Malistaire starts with 1 pip, has a horrible power pip rating, casts a scarecrow every 100,000,000,000,000,000 turns, and doesn't get any criticals or blocks. With out his 10k health, he would have been killed WAY before Ambrose called us.
i realize now i did forget that last boss in waterworks is WAY stronger with his 24,000 health and i think he is also the boss that uses ra not pretty sure about the ra thing but i am sure when it comes to fighting morganthe she might be a little weaker than malisatire but good attacks