I like to party too, so let's update 703!

Corrupt Essence (703) has been updated to have an open cast version which will affect multiple targets. The number of additional targets is calculated by using the caster's Spirit and Elemental Mana Controls (with the higher of the two counting all ranks and the lesser counting half ranks) / 20.

Ixix

I'm pretty sure that you should be able to imbed it, rubbed/raised/tapped items are going to target the activator, and I'm pretty sure that wave is going to target your current target, or select a new target if you don't have one.

Invoking the spell from a scroll should let you access the open cast version though.

Ixix