Boreal Warden

Frostbitten Aura. A cold aura surrounds the Boreal Warden in a 100ft radius. On a failed save, a it does 11 (2d10) cold damage or half as much on a successful one. This effect also gives the effects of the slow spell (same mechanics to dispel it) and gives disadvantage on rolls whilst in this area no matter what.

Warden’s Rage. Once below half health, the Boreal Warden’s damage output is increased by 10 (1d20) until it is above half health, the creature also heals by 10 (1d20) health each of its turns until above three quarters of its health.

Telepathic Communication. This creature can communicate in any language through telepathy with a creature within a 150ft radius surrounding it.

Multiattack. The Boreal Warden may make two attacks, one with its crushing stomp and one with its head-but.

Head-butt. Melee Weapon Attack: +11 to hit, reach 30ft., one target. Hit: 39 (6d10 + 6) bludgeoning damage. 

Crushing Stomp. Melee Weapon Attack: +11 to hit, range 20ft., 10ft radius all targets in the radius. Hit: 50 (8d10 + 6) bludgeoning damage.

The Boreal Warden can take 5 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The Boreal Warden regains spent legendary actions at the start of its turn.

Legendary Resistance (1/5 Actions). If this creature fails a a saving throw, it can choose to succeed.

Grand Majesty (3/5 Actions). The Boreal Warden chooses up to four targets. On these creatures’ next turns they have disadvantage on rolls.

The Boreal Warden can use this action once per day.

Summon Creature. The Boreal Warden can summon a creature of its choice (from the list below) to defend it. This creature is immune to the Warden’s Frostbitten Presence.

Qurugosk, Sliernok, Varskela, Jotunhel, Tundrik or Yohsog.