Balog the living quake V4

The Living Quake. For every 20 feet Balog moves, all creatures within a 30 foot radius must make a dc 22 dexterity saving throw. all who fail the save take 4d6 bludgeoning and 4d6 force damage and fall prone. all who pass will take half as much damage and do not fall prone.

Spellcasting. Balog is a 8-level spellcaster. Its spellcasting ability is wisdom based (spell save DC 22, +13 to hit with spell attacks). Balog has following spells prepared:
Cantrips (at will):  Mold earth, 
1st level (8 slots): Earth Tremor, entangle

2nd level (7 spell slots) Earth bind, spike growth, heat metal.

3rd level (7 spell slots) Erupting earth, meld into stone

4th level (6 spell slots) Grasping vine

5th level (6 spell slots) transmute rock, wall of stone

6th level (5 spell slots) Bones of earth, Move earth

7th level ( 4 spell slots) Fire storm

8th level (3 spell slots) earth quake

Earthen teleportation: Balog sinks into the earth and gains a digging speed of 120 feet. all attacks against balog fail whilst in this action. Balog can stay underground until the next round of combat.

Golemic summon: Balog summons 1 clay golem for the duration of combat.

Heavy armed strike: Melee weapon attack: +14 to hit , reach 10 ft., 1 target. Hit: 18 (3d6 +4) bludgeoning damage and (3d6+4) force damage. forces target to make a dc 20 strength saving throw or be forced into prone condition

Four arm strike. Melee Weapon Attack: +14 to hit, reach 10 ft., 1 target. Hit: 24 (6d6 + 4)  force damage and (6d6 + 4) bludgeoning  damage.

Boulder throw. Ranged Weapon Attack: +1 2to hit, range 300/600 ft., 1 target. Hit:  23 (4d8 + 12) bludgeoning damage.

Quaking stomp: Balog stomps his foot into the ground halving all creatures speed within a ten foot radius until their next turn.

Stunning Jump: when the jump action is taken and balog lands within 10 feet of a creatures, they must make a dc 18 constitution check or be stunned until their next turn.

Earthen shield: Balog can expend a reaction to create a shield of minerals and stone to reduce damage by (3d12) against one attack. This can be used up to 5 time in one day.

Earthen reinforcement: Balog can expend a reaction to reinforce his skeleton and muscles with the strength of the earth. Balog gains advantage on any strength or constitution based saving throws thrust upon him.

Legendary Resistance: 3 per day

(1 action)  Multiattack: Balog makes 2 four armed strikes and then one boulder throw.

(1 action)  Quick casting: Balog casts 1 spell 5th level or lower and makes a boulder throw attack action

(2 actions) Binding Bury: Balog grabs a creature and slams them into the ground giving them the grappled condition and reducing their movement to zero. the creature must make a dc 18 strength check to break out of the burying bind.