[Poruku]

If parted pain activates on that and you can't use aoe or focus it, then that would be blatantly overpowered.
The youkai attacking at the same time as you sounds like an interesting concept, but your own damage should be nerfed in that case. Or your attack gets replaced by the youkai's but it's boosted. Still I don't know if this is a good idea

All we really need is for the youkai to count as summoned and nearby for the effects of other skills.