Which spells/grimoire combination?

So my ability points are gathering dust because I can't decide where to spend them. Which spells are a must have? Which unique grimoire do you favour? Why? Which unique wand (im using the lightning one despite the bug)?

So my ability points are gathering dust because I can't decide where to spend them. Which spells are a must have? Which unique grimoire do you favour? Why? Which unique wand (im using the lightning one despite the bug)?