Achilles' Sandal

Introduction
Achilled was a warrior who was dipped in the River Styx by his mother, and as a result became invincible in battle. However, he still had a weak spot on his ankle, since that was the spot which his mother forgot to place in the River Styx.

Effects
When the sandal is worn, it will enhance the user's strength and wisdom, and it will make them become invincible and impervious to all forms of attack. The only way to make the user lose their power is if they are struck in the ankle.