Bone general

Undying Hunter (Recharge 6). As a bonus action, the Bone general can regain 50 hit points.

Multiattack. The Bone general makes four attacks with its one-handed longsword or two attacks with his two-handed longsword

Longsword. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage if one-handed, or 16 (2d10+5) slashing damage if two-handed

Perfect Defence 3/day. As a reaction when a creature makes an attack against him, the Bone general can start a deflective dance of swords, until the start of it's next turn, his AC is increaced by 5 and every creature that starts or finishes its turn within 5 ft recives 7 (1d4+5) slashing damage.

Legendary Resistance 1/day. If the bone general fails a saveing throw, it can choose to succeed instead

Legendary Actions 2/Round (Recharges at the end of it's turn). At the end of another creature turn, the Bone General can make one of the following actions:

Relentless Hunt. The Bone General makes a perseption check with advantage

Grappling Claw. The Bone general moves up to half its walking speed with out provoking an opportunity attack and makes an attempt to graple a creature within melee range, if the grapple succeeds, the target is knoked prone

Horror of the grave. The Bone General forces one creature it can see within 60 ft.  to make a DC 15 Wisdom saveing throw or become frightened of him until the end of its next turn