>>283258505
Reg is humble unlike Megumin.
But they would be a disruptive (one shot) weapon together. Reg makes a hole, then Megumin throws explosion in.
Also Aqua and wather magican Ryo could make Rimuru's megiddo by water/ice huge lens(es)
(Rimurus megiddo lenses should have been bigger for such a great power, or accumulate energy for a while)