Just to echo what other people have said, but in some stronger words.
Imp renew is trash, dont take it.
I have holy nova in my build, partly because I dont have any other character so I need it to farm. It's honestly useful in raids, vael comes to mind, and sometimes I find time/mana to press it in aoe packs.
Been tempted recently to take spell warding, even considered dropping 2 points of crit for it. Holy crit is basically "only" chance to get inspiration up, any extra healing from crits are often overheals. And whenever you take damage, it tends to be magical.