Armor (shield), legendary (requires attunement)
This heavy magic shield absorbs attacks and reflects them back. While holding this shield, you have a +2 bonus to AC. This bonus is in addition to the shield's normal bonus to AC. Immediately after an attacker misses you with a melee attack, you can use your reaction to force the enemy to roll the weapon's damage against themselves.
A creature wielding Guthix's Anvil has disadvantage on all attack rolls unless their size is huge or larger. Additionally, a creature that is large or smaller must have a strength score of 23 or higher to wield this shield.
Guthix's Anvil is one part of the Tools of the Dragon Lords alongside Forgebreaker, and is capable of forging and destroying Orbs of Dragonkind when used in conjunction with it.