Commander Niall

At My Command. As a bonus action, Commander Niall can order one of his allied Banished Knights to use their reaction to make a weapon attack against a creature he is attacking. Banished Guardians. When Commander Niall rolls initiative he has advantage and in addition two banished knights join him from the ethereal plane. These Knights act on the same initiative count as Commander Niall.

Frostbitten. For each Frostbitten creature that creature suffers the following effects.

• A frostbitten creature's speed is halved.
• The creature can take its action or bonus action, but not both.
• Regardless of the creature’s abilities or magic items, it can’t make more than one melee or ranged attack during its turn.
• If the creature takes fire damage, the condition ends.

Reactive. Commander Niall can take one reaction on every turn in combat.

Multiattack. Commander Niall makes three weapon attacks with his 'Commander's Standard'

Commander's Standard. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 18 (2d10+6) piercing damage plus 9 (1d8+4) cold damage.

Charging Icy Maelstrom (Recharges 5-6). Commander Niall begins to spin his battle standard around conjuring up a whirlwind of bitter winds in a radius of 30 ft around him. The Maelstrom lasts until the start of Commander Niall's next turn or he uses a 'Hailstone Dash'. Any enemy creature caught within must make a DC 18 Constitution Saving throw or take 40 (8d8+5) cold damage and receive a counter of 'Frostbitten'. On a success take half damage. Allied creatures within the radius deal an additional 1d8 cold damage on their weapon attacks for 1 minute.

Thunder Stomp (2/Day). Commander Niall slams his foot into the ground releasing a wave of rolling thunder in a 30 ft cone. Each creature in that area must make a DC 18 Dexterity saving throw, taking 37(5d12+5) Thunder damage on a failed save, or half as much damage on a successful one.

Hailstone Dash. If a creature moves inside of the radius of the 'Charging Icy Maelstrom', then Commander Niall may dash towards the target. Immediately making a Commander's Standard attack with advantage. For any Frostbitten target add 1d8 cold damage to the attack.

BANISHED KNIGHT

Medium humanoid, lawful neutral
Armor Class 20 (plate, shield) Hit Points 100 (10d10 +40) Speed 30 ft.
STR 20 DEX 16 CON 18 INT 16 WIS 12 CHA 11
Saving Throws Dex +7, Con +8
Skills Athletics +9, Perception +5
Damage Resistances fire, lightning
Senses darkvision 120 ft., passive Perception 15
Languages Common
Challenge 9 (5,000 XP)

Traits

Frostbitten. For each Frostbitten creature that creature suffers the following effects.

• A frostbitten creature's speed is halved.
• The creature can take its action or bonus action, but not both.
• Regardless of the creature’s abilities or magic items, it can’t make more than one melee or ranged attack during its turn.
• If the creature takes fire damage, the condition ends.

Actions

Multiattack. The Banished Knight makes three Longsword attacks.
Longsword. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 9 (1d8+5) slashing damage, or 11 (1d10+5) slashing damage if used with two hands.
Sleet Stride (2/Day). The Banished Knight lowers its shield to its chest and rushes up to half its movement forward towards a target creature. The creature must make a DC 15 Dexterity Saving throw or take 20 (3d10+3) cold damage and gain a 'Frostbitten' Counter. On a success take half damage.

Reactions

In Service. The Banished Knight may use its reaction whenever the Commander Niall is subjected to damage, Commander Niall takes no damage and instead regains a number of hit points equal a quarter of to the damage dealt.