Skills like Reap should trigger Impale

The Impale bonus from Bone Storm and some passives seems alright, but on a pure caster build without minions it seems completely pointless.

I'm thinking it would be thematically fitting to have melee-like abilities such as Reap be able to harvest the bonus damage. Reap in itself seems a bit weak and that would make it flow better, switching between ranged and melee spells without feeling like you're losing out on a lot of damage.

You could lower the Impale damage but give a bonus if allies trigger it, to retain the functionality while also making it useful on a caster.