Falling Icicle
Adventurer
I really like how spells can be cast in higher level slots, such as fireball to do more damage, etc. Unfortunately, most of the spells that do this are offensive spells. I think this mechanic should be used for most other types of spells as well, not just for increased damage. There are plenty of other things that could be improved with higher level slots than just damage, such as duration, range, area of effect, or number of targets affected. Here's a few other examples:
Find Familiar: higher level slots allow you to find more powerful familiars, like imps or mephits.
Gust of Wind: higher level slots increase the wind speed.
Mirror Image: creates one additional image per +spell level.
Polymorph: higher level slots allow changing into the forms of additional types of creatures.
Find Familiar: higher level slots allow you to find more powerful familiars, like imps or mephits.
Gust of Wind: higher level slots increase the wind speed.
Mirror Image: creates one additional image per +spell level.
Polymorph: higher level slots allow changing into the forms of additional types of creatures.