Wurmzag, Grand Chieftain of Frost Urruk Clans

Ironhide Flesh. - Wurmzag has DR/5 against Fire, Piercing and Slashing Damage and is immune to Bludgeoning and Force Damage.

Extra Attack. - You can attack twice whenever you take the Attack action on your turn.

War Priest. - When you use the Attack action, you can make one weapon attack as a bonus action. You can use this feature 2 times per long rest.

Sorcery Points. - You have 6 sorcery points, and you gain more as you reach higher levels, as shown in the Sorcery Points column of the Sorcerer table. You can never have more sorcery points than shown on the table for your level. You regain all spent sorcery points when you finish a long rest.

Twinned Spell. - When you cast a spell that targets only one creature and doesn’t have a range of self, you can spend a number of sorcery points equal to the spell’s level to target a second creature in range with the same spell (1 sorcery point if the spell is a cantrip). 

Quickened Spell. - When you cast a spell that has a casting time of 1 action, you can spend 2 sorcery points to change the casting time to 1 bonus action for this casting.

Great Axe. Melee Attack: +8 to hit, reach 5ft., (1d12 + 7) [Slashing] damage. 

Rage and Spittle. Wurmzag roars with such force it can shatter wood and burst organs.
Ranged Weapon Attack: +8 to hit, range 25ft. Cone, (3d4 + 4) [Sonic] damage.

Spellcasting. The Urruk Shaman is a 6-level Sorcerer. Its spellcasting ability is Charisma (spell save DC 16, +6 to hit with spell attacks). The Urruk Shaman has following Sorcerer spells prepared:

1st level (6 Casts): Ice Knife, Armor of Agathys, Chromatic Orb (Ice)

2nd level (4 Casts):   Freezing Ray, Wall of Ice

3rd level (3 Casts):   Cone of Cold, Ice Storm

4th level (2 Casts):   Freezing Sphere

Battle Master. If the Urruk is flanked and receives damage from behind, he reaches back, grapples the target and throws them up 1d6 x 5ft away.

Melee Attack: +8 to hit, reach 5ft., (1d6) Bludgeoning damage. Target is thrown 1d6 x 5ft away.