Culmination of Blade

Legendary Resistance (5/Day). If Culmination of Blade fails a saving throw, it can choose to succeed instead.

Nebulous Defense. Culmination of Blade takes 5 less damage from all sources

Reactive. Culmination of Blade has 4 reactions

Absolute Attacks. Culmination of Blade's Attacks ignore all Immunity and resistances, save for the effects of the wish spell

Unsheathing (Recharges after a Long or Short Rest). When Culmination of Blade Reaches 0 hit points it regains 440 hit points, all expended uses of legendary resistance, it's Multiattack increases to 6 attacks, and it gains 2 additional reactions. Additionally Culmination of Blade can now use the options in the "Mythic Actions" section.

Multiattack. The Culmination of Blade makes four Sabre of Ageless Skill attacks

Sabre of Ageless Skill. Melee Attack Roll: +19, reach 20 ft. Hit: 34 (4d12 + 10) Slashing damage.

Fourfold Sign (Recharge 5-6). Dexterity Saving Throw: DC 27, four non-contiguous 30-foot cubes within 300-feet. Failure: 64 (4d12+40) Slashing Damage plus 24 (12d4) Force Damage. Success: Half Damage

Wind Of Remedial Healing (5/day). Culmination of Blade heals 36 (6d6+18) hit points and the benefits of the Greater Restoration spell 

Lake Ripple Advance. Culmination of Blade Teleports to a point within 120 feet

Parry. Trigger: Culmination of Blade is hit by a melee attack roll while holding a weapon. Response: Culmination of Blade adds 5 to its AC against that attack, possibly causing it to miss.

Savage Riposte. Trigger: an attack misses Culmination of Blade. Response: Culmination of Blade makes two Sabre of Ageless Skill attacks on the attacker

Legendary Action Uses: 5. Immediately after another creature’s turn, Culmination of Blade can expend a use to take one of the following actions. Culmination of Blade regains all expended uses at the start of each of its turns.

Faultless Slice. Culmination of Blade makes two Sabre of Ageless Skill attacks

Tendon Severing (Costs 2 Actions). Dexterity Saving Throw: DC 27, one target within 30 feet. Failure: The Target is paralyzed. Success: 17 (2d12+5) Slashing Damage

Parallax Thrust (Costs 2 Actions). Dexterity Saving Throw: DC 27, a 20-foot wide 320-foot long line. Success: Target is Prone. Failure: 80 (20d8) Piercing Damage and all targets have Fundamental Bleeding, Constitution Saving Throw: DC 20, at the end of each turn. Failure: 10 (2d10) Piercing Damage, increases by (1d10) each turn. Success: Effect ends. This legendary action can't be used until the end of Culmination of Blade's next turn.

if Culmination of Blade's Unsheathing trait is active, it can use the options below as legendary actions.

Mortal Wound (Costs 4 Actions). Constitution Saving Throw: DC 27, One Creature within 30-feet. Failure: 300 Slashing Damage. Success: 170 (20d12+50) Slashing Damage

Acausal Slight (Costs 5 Actions). Culmination of Blade gives five Targets four Conditions of its Choice.