Armaldo

Battle Armor. The armaldo's scales are so strong that it doesn't take extra damage form critical hit.

Swift Swim. When the armaldo is submerged in water, it doesn't activate an opportunity attack.

Form Water To Land. The armaldo can breathe water, and it can hold its breath for 10 days without any problems, after that it gets exhaustion 3, until it dies at 15 days without breathing.

Multiattack. The armaldo makes two attacks: one with its Crushing Claw and one with its Claw.

Multiattack ranged. The armaldo makes five Plate Blast attacks.

Crushing Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6,5 (1d8 + 2) slashing damage +, hit:  6,5 (1d8 + 2) bludgeoning damage, that uses the enemy's natural ac to hit.

Claw. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 6,5 (1d6 + 3) slashing damage.

Plate Blast. Ranged Weapon Attack: +0 to hit, range 40/100 ft., one target. Hit:  2,5 (1d4) [bludgeoning] damage.

Tail Smack. Melee Weapon Attack: +6 to hit, reach 10 ft., one target. Hit: 4 (1d4 + 1) bludgeoning damage.

Ram. If the armaldo is dashing while submerged in water it can move to an enemy's space to make a: Melee Weapon Attack: +8 to hit, reach 0 ft., one target. Hit: 22 (4d6 + 8) bludgeoning damage. and get knocked 10 ft back opposite form where it was hit. The target has to do a dc 15 strength check or get the Prone condition, and get knocked 10 ft back opposite form where it was hit. The armaldo has to move at least 35 ft straight toward the target immediately before the hit to use the attack.

Tail Smack. if the armaldo attack with a melee attack that doesn't hit it, it can use its Reaction to do make a Tail Smack attack.