I think it has to do with my screen-reading shader reading its own texture, which causes parts of the screen to not clear. This is what I get for trying to render liquids on a separate layer.

When the spell is cast, the mana spent on the BRIDGE spell gets transferred to its projectile, which uses it to cast the PILLAR spell once per loop until it runs out of mana. At some point I want to add syntax for explicitly stating how much mana to use, so spells can last longer than one second.

For example, here is the code for the ice bridge spell. HEAT is a built-in spell that costs 1 mana for each unit heated or cooled. The PILLAR spell casts HEAT once, so it costs 50 mana. The BRIDGE spell casts PILLAR once every loop (10 per sec) so we estimate it being worth PILLAR * 10; 500 mana.

Thanks! I'm trying to make a wizard game where you create the spells yourself with code. I'm making a system for elemental spells to cover the ground with their respective material, which has resulted in the delicious substance seen in the video.