Light's Bane, Warblade of the Dhantet (Tanar'domosh Ulathoal)

LIGHT'S BANE, WARBLADE OF THE DHANTET (TANAR'DOMOSH ULATHOAL)

Weapon (Rapier) Legacy Weapon (Requires Attunement by a Wizard) Can be used by an arcane focus.  

Backstory
Unlike many legacy weapons with famed parentages Light's Bane, Warblade of the Dhantet is of unknown origins. Aside from being connected to Olo Silver's patron named Petra, little else is known about the blade or its powers. Originally a wand and connected to Arietta Graves, the warlock in league with the Demon Lord Kothradin, Light's Bane, Warblade of the Dhantet has manifested as a shadow-infused rapier. Its owner, Petra, seemed relatively unconcerned with Graves' death and Kothradin's defeat, instead bonding herself to the young bladesinger. What remains to be determined is Petra's connection to the weapon itself, her motives, and why she wasn't banished with the rest of Kothradin's demons when the ritual was broken...

Character Level/Rarity	Abilities
1/Common	The wielder is resistant to psychic damage and cannot be charmed, frightened, or possessed with the exception of Petra. Shadow Blade. Light's Bane, Warblade of the Dhantet is not entirely of this plane and exists between it's parent plane and the mortal realm. As a bonus action, the wielder may have the weapon adopt the principles of the Shadow Blade spell, without requiring concentration - the burden of the spell falling on the wielder's patron. The wielder must consume a spell slot to activate Shadow Blade. Spiteful Lover. When the wielder rolls a 1 during an attack roll Petra becomes frustrated with the wielder's abilities. She is given a counter which can be expended to make the wielder roll their next roll with disadvantage. The counters disappears following the end of the encounter as Petra loses interest.   Feature:  Whenever the blade is drawn the the imprint of a woman's palm appears on the wielder's chest in a dark-red color. The mark causes the wielder no pain but it seems to glow slightly on closer inspection. Small bite marks such as a lover would leave after a passionate night of love appear on the wielder's next with the same properties.
5/Uncommon	The wielder has +1 to attack and damage rolls.  The wielder must attune to Light's Bane, Warblade of the Dhantet at this rarity and higher.
9/Rare	Blade Hunger. When you Attack a creature with Light's Bane, Warblade of the Dhantet and roll a 20 on the Attack roll, that target takes an extra 3d6 necrotic damage, provided that the target isn’t a construct or an Undead. You gain temporary Hit Points equal to the extra damage dealt.
13/Very Rare	The wielder gains +2 bonus to attack, damage, and spell rolls made with Light's Bane, Warblade of the Dhantet Blade Choir Once per day, when the wielder invokes the bladesong they may call upon Light's Bane, Warblade of the Dhantet to assist with the invocation. The bladesong does not consume a slot when invoked.
17/Legendary	The wielder gains +3 bonus to attack, damage, and spell rolls made with Light's Bane, Warblade of the Dhantet Shadow Step. When wielding Light's Bane, Warblade of the Dhantet you gain the ability to step from one shadow into another. When you are in dim light or darkness, as a bonus action, you can teleport up to 120 feet to an unoccupied space you can see that is also in dim light or darkness. Petra's Chosen. As the master of Light's Bane, Warblade of the Dhantet you may use it seize control of the bond to Petra. Reversing the fell magics, you can summon Petra to the mortal plane to fight at your side. Petra uses the REDACTED block when summoned.