That double concentration thing is one of the strong arguments against selecting part of UAmystic3 psionics for DS 5e for me.
Concentration is there for a reason, it is a heavy balancer, also, what if his concentration is broken, do his two spellslots go down the drain?
I would heavily advise against this mechanic even in a homebrew. If at all, it should be coupled to soem artefact wit hattached drawbacks and ... in the end you should lose it, means artifacts should not be permanent magic items for PCs, either they need destroying or put to use for some big purpose (also taking them from the party e.g. an artefact sword slaying the big evil but gets dissolved by that)
Concentration is there for a reason, it is a heavy balancer, also, what if his concentration is broken, do his two spellslots go down the drain?
I would heavily advise against this mechanic even in a homebrew. If at all, it should be coupled to soem artefact wit hattached drawbacks and ... in the end you should lose it, means artifacts should not be permanent magic items for PCs, either they need destroying or put to use for some big purpose (also taking them from the party e.g. an artefact sword slaying the big evil but gets dissolved by that)
