Prism, The Flawless [CARD] (Patreon)

Weapon (greatsword), legendary (requires attunement)

You gain a +3 bonus to attack and damage rolls you make with this magic weapon. This weapon deals double damage to objects and structures. While in bright light, this weapon deals an additional 2d6 radiant damage.

Mana Refraction. While holding this weapon, if you cast a spell that deals a type of damage from the following list (acid, cold, fire, lightning, poison, thunder), you can change that damage type to one of the other listed types as the magic is transformed within the facets of this weapon.

When a friendly creature within 5 feet of you casts a spell that deals a type of damage from the following list (acid, cold, fire, lightning, poison, thunder) you can use your reaction to change that damage type to one of the other listed types.

Arcane Convergence. When you cast a spell that deals a type of damage from the following list (acid, cold, fire, lightning, poison, thunder) while holding this weapon, you may have the spell deal maximum damage instead of rolling. Once you use this property it can’t be used again until the next dawn.

Borne from pressure and heat unimaginable, this gem of prodigious size sparkles and glitters in the light as it warps arcane energies that course through it. The manner in which it does so baffles any that attempt to unravel its secrets as they find themselves only more perplexed than ever by the curious crystalline structure. Even after being thrown into the crucible of battle this blade emerges perfect and pure, a shining beacon unmarred by the ugliness of our world's petty squabbles.