Life Buildings

How will regeneration help the Crusaders? They have 70 HP, if I'm not mistaken (or thereabouts). There will be losses against any Tier 3 unit. But if you have a combination of a Mage of Order, a Mage of Life, a Tactician, and Crusaders, then yes – such a team can even take down a Tier 4 unit. Illusions, slowing, removing retaliation, buffing the main stack, and cutting everything to shreds on the battlefield.

That's why there are two Mages of Life – to quickly apply buffs to the Crusaders.
Regeneration allows you not to heal the Crusaders every time; you can regenerate, attack, and regenerate again, and the Crusaders won't even spend any health.
And I really did forget about the Mage of Order, but he is still needed only to remove retaliation with the help of illusions; there is not much point in slowing down one stack, and instead of a general slow, it is better to combine one stack.
But if you find a Staff of Illusions, then the need for a Mage of Order in this case disappears.
But in general, it is definitely worth developing a Mage of Order. It's not even a question