Ambusher. The drake has advantage on attack rolls against a creature it surprised.

Poisoning Resistance. The drake has advantage on saving throws against being poisoned.

Multiattack. The drake makes three melee attacks or two ranged attacks. 

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) piercing damage plus 3 (1d6) acid damage.

Tail. Melee Weapon Attack: +3 to hit, reach 10 ft., one target. Hit: 6 (1d8 + 2) bludgeoning damage.

Claws. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) slashing damage.

Acid Spit. Ranged Weapon Attack: +4 to hit, range 15/35 ft., one target. Hit: 7 (2d6) acid damage and the target must succeed on a DC 14 Constitution saving throw or have their Armor Class decreased by 1. If the target has it's AC decreased to -2 less than its max AC and is wearing armor, the creature's armor gets a permanent -1 penalty. If the creature's armor gets a -5 penalty, it is destroyed by acid and cannot be repaired normally.