Darkslayer

Weapon (war pick), rare (requires attunement) This war pick is crafted wholly from a dark iron that does not seem to reflect light. You have a +2 bonus to attack and damage rolls made with this magic weapon. When in dim or no light, the attuned wielder has advantage on stealth and perception checks, and gains Tremorsense in a 60 foot radius. Immediately after taking damage, the attuned wielder can use a reaction to magically become invisible until the end of their next turn or until they attack, deal damage, or force someone to make a saving throw. Once this ability is used, it cannot be used again until the wielder completes a long rest. Furthermore, while attuned to the weapon, the wielder can cast both Hunter's Mark and Longstrider once per long rest. Proficiency with a war pick allows you to add your proficiency bonus to the attack roll for any attack you make with it.