It might set a single boss with a health pool of 2 million for you alone, but when the four come together, each boss only has 600,000 health, and their skills and attributes are also somewhat weakened.
Of course, there are advantages too, as bosses in combination have more skills and are more difficult for adventurers to deal with, usually resulting in a higher winning rate compared to fighting one boss alone.
However, what could have been four separate boss battles can now only be one.
Mo Fei, upon seeing these four Elemental Princes, immediately understood Al'Akir's strategy. Having once been the final boss in a dungeon himself, he knew that earlier bosses essentially pave the path for the final boss's victory.
Al'Akir must be planning to force out Mo Fei's trump cards with this method. If they came one by one, Mo Fei wouldn't need to exert much effort.