Homebrew
Amphibious. The drake can breathe air and water.
Multiattack. The drake makes three attacks: one with its bite and two with its claws. Bite. Melee Weapon Attack: +7 1d20+7 to hit, reach 10ft, one target. Hit: 15 (2d10+4) 2d10+6 piercing damage plus 7 (2d6) 2d6 fire damage. Claw. Melee Weapon Attack: +7 1d20+7 to hit, reach 5ft, one target. Hit: 11 (2d6+4) 2d6+4 slashing damage. Fire Breath (Recharge 5-6). The drake exhales fire in a 30ft cone. Each creature in that area must make a DC 14 Dexterity saving throw, taking 42 (12d6) 12d6 fire damage on a failed save, or half as much damage on a successful one.
Poisonous Odor. The lair of the forest drake exudes a horrible stench that can overwhelm the senses of nearby creatures, causing them to become nauseated and roll disadvantage on checks to maintain concentration. Creatures which are immune to the poisoned condition ignore this lair action.
Jungles