Motivation: I am playing a "solo" adventure with a wizard and a healbot cleric NPC/DMPC. A lot of times it would be more helpful if the cleric increased the damage output instead of healing/buffing; I am inclined not to do that by direct damage as the player enjoys blasting things.
I tried looking for a spell that increases spell damage, either by buffing the wizard or debuffing the enemies but couldn't find any. Ideally I want to directly increase damage taken (for example compared to increasing dps by increasing hit change).
I thought about creating a custom spell, perhaps basing it on the Maximized metamagic e.g. "the next spell of the target is casted as if it was maximized assuming that it is not higher than the spell slot you used for this spell-2" but I'm not sure about the balance.