Fizban's Treasury of Dragons
Draconic Essence. When you summon the drake, choose a damage type: acid, cold, fire, lightning, or poison. The chosen type determines the drake’s damage immunity and the damage of its Infused Strikes trait.
Bite. Melee Weapon Attack: +3 plus PB to hit, reach 5 ft., one target. Hit: 1d6 plus PB piercing damage.
Infused Strikes. When another creature within 30 feet of the drake that it can see hits a target with a weapon attack, the drake infuses the strike with its essence, causing the target to take an extra 1d6 damage of the type determined by its Draconic Essence.