5 spells, what triggers each and what it costs to cast
Data from build 25583279, updated
Nobody sells you a spell. Each one arrives in a cutscene, and some of those scenes sit behind a quest or a story gate.
For Summon Rain, Growth and Dragon's Breath, the game starts the seal-breaking scene itself, and no quest or story requirement is listed for it.
Requires: Reached floor 10 of the mines. Casting costs 4 mana. Your mana pool becomes 4.
Requires: Water seal broken. The scene plays at Farm. It waits on the Break water seal scene, which has no quest or story requirement listed. Casting costs 4 mana. Your mana pool becomes 8. Story mode only.
Requires: Earth seal broken. The scene plays at Farm. It waits on the Break earth seal scene, which has no quest or story requirement listed. Casting costs 8 mana. Your mana pool becomes 12. Story mode only.
It waits on the Break fire seal scene, which has no quest or story requirement listed. Casting costs 8 mana. Your mana pool becomes 16.
Dragon's Breath8 manaMana pool after: 16
It comes out of the quest Find the Magic Key. Casting costs 4 mana.
Sacred Light4 mana
Quest Find the Magic Key