There are only 6 Sanso in existence, most of these blades hidden behind walls of labor that one must provide to prove to each blade that they are worthy of wielding them.

This blade once gained, becomes a +1,+2 and +3 weapon that is attuned to you, at levels 6, 10 and 14 respectively. You may use only one of these blades at a time, and can switch to any other blade after a short rest. 

Tobimune (Requires 3 - Part questline): An Odachi (Finesse Greatsword) bearing the symbol of the Raven Queen, a gift forged by Susanoo towards her... transforming the wielders of this blade, and giving them wings of a crow, however blinding them, as death is unforgiving. When wielding this blade, you lose any and all forms of sight, and instead gain blindsight & tremorsense upto a range of 60ft.,

-- Crow (Level 10) - When wielding this blade, you may take the dash action as a bonus action, you leave behind a feather at the location on which you started your turn. Additionally, as a reaction and expending a pact slot, Tobimune allows its user to instantly exchange locations with any feather that you leave behind as you trail the battlefield.

-- Owl (Level 10) - As a magic action and expending a pact slot, Tobimune summons two gigantic owl eyes in the sky, massively enhancing the wielder's senses to cover an area, allowing them to detect spirit energy within. Upon use of this ability, your blindsight range increases to 80ft , and you may instantly teleport to creatures that are not hidden, or behind full cover, at the start of your turn as a bonus action.

-- Suzaku (Level 14) - Tobimune summons flames around its wielder's wounds, healing them, Suzaku has been shown to be able to heal even normally fatal wounds. As a bonus action and expending a pact slot, whenever you are reduced to 0 hp, but not outright dead, you may regain hp at the start of your turn, equal to your expendable hit die + your charisma modifier.

Note: The weapon's +x bonuses are not automated, so make sure to use Avrae custom commands for that.

Please note, all buffs with expending a pact slot, last for a duration of one minute and no more. Once each blade's separate ability is used, they cannot be used again until a long rest.

Proficiency with a Greatsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Weapon Property: Finesse, Sense: Blindsight, Sense: Tremorsense, Pact of the Sword Bearer Warlock, Damage, Combat, Heavy, Two-Handed, Graze