Type: Great Hammer, Rarity: Legendary Artifact, Attunement Required
A two handed axe that has been eroded by the sea to the point that it serves better as a hammer. the hilt is made from Mythril that has been tainted by the sea and the head was forged from dark steel.

2 handed
Heavy
Slashing / Bludgeoning
3 D6
+3 to Hit and Damage

Deep Sea's Strength
If you have proficiency in Martial weapons and Athletics you can double your strength bonus for damage on this weapon.

Old God's Seal
This weapon ignores all resistance and immunities.

Quake
You can use an action to slam the ground with all your might.
Creatures in a 20ft radius from your location must make a Dex save with a DC equal to 12+ your strength bonus, if they fail they are knocked Prone.
If you have Proficiency in Athletics your DC is increased to 14+ Strength bonus.

Lore

It is said that this mighty weapon was able to shatter a seal that the very old gods had crafted. Nobody remembers who this weapon belonged too or how it came to be but the name of the weapon alone sparks awe and Mystery.

The Hammer/Axe appears to have once been a great axe that was eroded and morphed by the deepest waves of the Sea. an Ancient Symbol is engraved into the head of this mighty weapon that has unknown Origins.