Actions

Multiattack. The Befallen Commander makes four attacks with his Combine Greatsword. He may also use Harm Touch or Poison Breath when it is available.   Combine Greatsword. Melee Weapon Attack: 1d20+15 to hit, reach 5 ft., one target. Hit: 15 ( 2d6+8 ) slashing damage plus 21 ( 6d6 ) cold damage. The weapon scores a critical hit on a 19-20 and does 20 slashing and 36 cold damage when it scores a critical. A creature that takes any cold damage must succeed on a DC 20 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.   Harm Touch (Recharge 5-6). As the harm spell, but rolled damage does a minimum of 66 necrotic damage.   Disease Breath (Recharge 5–6). The Befallen Commander exhales disease filled poisonous gas in a 30-foot cone. Each creature in that area must make a DC 20 Constitution saving throw. On a failed save, a creature takes 35 ( 10d6 ) poison damage and is poisoned for 1 minute. While poisoned in this way, the target can't regain hit points, and it takes 21 ( 6d6 ) poison damage at the start of each of its turns. The poisoned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. On a successful save, the creature takes half as much damage and isn’t poisoned. Creatures immune to disease (like paladins and monks of a certain level) are immune to this attack as well. A humanoid reduced to 0 hit points by this damage dies and rises at the start of Befallen Commander’s next turn as a dark bone skeleton (use a Medium sized minotaur skeleton's statblock, the skeleton is also immune to cold and takes half damage from slashing and piercing). The dark bone skeleton acts immediately after the Befallen Commander in the initiative count and is permanently under his command, following his verbal orders.  

Bonus Action

• At will: detect magic, necrotic bomb (as fireball, but necrotic damage)
• 3/day each: hold monster, abduction of strength (CON or target takes -5 STR, Commander gains +5 STR), banshee aura (3 necrotic per attack, active), scream of death (power word kill), shroud of hate (WIS, D/A to attack rolls exchange), shroud of pain (WIS, -3/+3 AC exchange)

Reactions

Deathblow II. When a character is reduced to 0 hit points, the Befallen Commander makes an attack roll with advantage against the character with his Combine Greatsword. If the the Befallen Commander hits, in addition to the damage dealt, the target automatically fails 2 death saving throws.

Legendary Actions

The Befallen Commander gains a special legendary action called Retaliate.

• Retaliate. Each time the Befallen Commander is attacked he may use Combine Greatsword against attacker for each hit landed on the Commander. He becomes ethereal and moves up to his speed to get within range of a target. While ethereal the Commander has resistance to all damage and ignores terrain.

Lair Actions

On initiative count 20 (losing initiative ties), the Befallen Commander takes a lair action to cause one of the following effects. He can’t use the same effect two rounds in a row.

• The tomb trembles violently for a moment. Each creature on the floor of the tomb must succeed on a DC 19 Dexterity saving throw or be knocked prone.
• The Befallen Commander targets one creature he can see within 60 feet of him. An antimagic field fills the space of the target, moving with it until initiative count 20 on the next round.
• The Befallen Commander targets any number of creatures he can see within 30 feet of him. No target can regain hit points until initiative count 20 on the next round.

Suggested Environments

Befallen