The other divide this spell gives is the classic "1-2 fights vs 6-8 fights players".
For players that do the full 6-8 fights commonly, barbs is probably going to be a solid but not OP addition. Afterall, these spellcasters are well taxed on spell slots, so the extra usage of spells is going to be felt.
Meanwhile, the party's that nova more often because they face fewer but more powerful enemies....those people are going to lap this spell up, as its basic just a pure power boost to them.
For players that do the full 6-8 fights commonly, barbs is probably going to be a solid but not OP addition. Afterall, these spellcasters are well taxed on spell slots, so the extra usage of spells is going to be felt.
Meanwhile, the party's that nova more often because they face fewer but more powerful enemies....those people are going to lap this spell up, as its basic just a pure power boost to them.