Army Of One

Whilst wielding a melee magic weapon used to cast the spell, the caster is embuled with magical strength, before charging to strike their hapless foes. 

After successfully casting the spell, for 1 round of combat, your strength bonus is increased by 4. Secondly, pick up to 10 enemy target creatures, on a hit they take 6D12 damage. Any enemy target creature that drops below 0 hp is instantly vapourised by the caster's weapon. Finally after dealing damage, the caster becomes resistant to all slashing, piercing and bludgeoning attacks, until their next turn, as if they cast the blade ward cantrip.