E (Flow)

Strategy and Synergy
Most spells in the game are eligible for this upgrade, if not all of them.

This upgrade can be used to refund a flow stack upon casting a spell. For spells that does generate flow on cast such as, it will add an extra flow after the spell is cast.

The E upgrade is a strong option to take when running with a -Deck, allowing the pickup of some non-flow spells to add up to the deck, letting you cast them without disrupting your flow stacks that much. This tactic ends up expensive on the long run, however, as it demands one for each non-flow spell.

Becomes obsolete once the player attains the artifact, since it will make all spells add a flow stack.