This came up with our game last night, with the players suggesting it would be easier to see a creature invisible under water, and I suggested that an aquatic caster might, know a version of the spell that is 'better' under water than the default.
So does casting invisibility under water affect it or not?
I can see answers for other systems
- pathfinder-1e Invisibility under water
- dnd-5e Are there any special rules governing invisibility underwater?