Crystal Lizard Golem

Magic infused. Crystal Lizard Golem is infused with large amounts of magic crystals and magic causing its attack to count as magical.

Underground Life Style. The Crystal Lizard Golem lives above and under ground gaining the ability to travers through the underground and beneath the sand doons, it has adapted its senses to see via its feeling and general perception.

Legendary Resistance (3/Day). If the Crystal Lizard Golem fails a saving throw, it can choose to succeed instead.

Multiattack. The Crystal Lizard Golem makes a Charge attack and than hit one of the down creatures with its tail.

Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., 2 target. Hit:  14 (4d8 + 5) Bludgeoning damage. The Crystal Lizard Golem charges up to two creatures ramming them, on a hit the creature needs to do a DC 16 dexterity save or be grappled.

Tail Swipe. Melee Attack: +11 to hit, reach 10 ft., 1 target. Hit: 18 (3d8+5) Slashing damage and (2d8) Piercing damage. The Crystal Lizard Golem swipes it tail on a hit the the creature needs to succeed on a DC 16 Constitution saving throw. If the creature fails, it starts to bleed, taking 2d6 damage at the start of its turn. This effect stacks up to 5 times

Toxic Stab(4-6). Melee Attack: +14 to hit, reach 10ft., 1 target. Hit: 18 (4d8+5) Slashing and 18 (4d8+5) piercing damage. On a hit the Crystal Lizard Golem secrets a green toxic guw from It's tail it the hit creature needs to do a DC 18 Constitution Save of take 9 (6d8) Poison damage and 9 (3d8) Acid damage and be poisoned. 

Leap. The Crystal Lizard Golem leaps 20 ft towards a location in a straight line.

The Crystal Lizard Golem can take 3 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 Crystal Lizard Golem regains spent legendary actions at the start of its turn.

Discharge (Recharge 1-20)(Costs 2 Actions). Creatures within 15 ft radius of the Crystal Lizard Golem needs to do a Constitution DC 19 save or take 6d12 force damage and be pushed 10 ft back, if the creature succeed they take half the damage and is not pushed.

Magic devour (Costs 2 Actions) (3/day).  Crystal Lizard Golem is affected or see a creature under an magical affect related to magic it can devour the effect succeeding the save and heals for 1d10+8 equal to the spell devoured or removes the affect and gains the positive effects.