Shortsword of Polymorph

Magical item, shortsword, requires attunement, Epic

This golden, vibrantly-shining shortsword is brimming with magical energy. It has a +3 bonus to attack and damage rolls.

Each time you make a successful melee attack against a creature, roll 1d6. On a 6, you can use your reaction to instantly transform them into a harmless creature no larger than their current size of your choice.