Most useful spells

[Skarg]

It seems to me that the thing about adventures is they involve different situations, and some spells fit some situations really well, but not so much others.

And in my experience, what makes a wizard most effective, is a clever player who thinks of good ways to use spells.

I have seen spells that some people consider practically useless be used to fantastic effect by clever players.

So I don't think there are "most" useful spells, but there are many very useful ones.

Aid has vast applications that few people put to full use.

Light might seem trivial until you don't have another source, and I've seen many creative uses for it.

Etc...