Lost Chapter is better for sustain than Morellos

Morellos Provides 400 mana.

Lost Chapter provides 250 mana and refills 20% of your mana when you level up.

Let's assume a pool of 1000 mana, then Lost chapter would be providing you 250 (base) + 200 Mana per level, meaning you only would need to level once in order for it to provide more mana than the item it's upgraded to.

Considering this, perhaps it would be a good thing to consider keeping Lost Chapter's passive, or at least a weaker version of it.