Alucard's White Wolf Form

Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The wolf has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 feet of the creature and the ally isn't incapacitated.

Intimidating Growl. As an action, Alucard can growl, snarl, or howl (player's pick) and aid himself and his allies by attempting to terrify any targets of his choice within 30 feet of his position. Until the end of Alucard's next turn, all attacks against any creature who fails their CON save (DC 18) are made with advantage. 

Blur. The wolf has advantage on Dexterity (Stealth) checks made to hide in any shadows or dim light, and can freely teleport up to 30 feet to a position he can see (for flavor, consider it a burst of incredible speed) after taking the attack action.

Crissaegrim. If Alucard's sword, Crissaegrim, is active and floating, it can still be controlled telepathically by Alucard even in wolf form. It can still take its parry reaction per usual, and if necessary, Alucard can hold (not wield or attack - simply hold) it in his mouth. If Crissaegrim is sheathed when Alucard transforms, it stays sheathed and changes form along with the rest of him, and cannot be summoned without reverting back to his normal bipedal form. 

Cloud Of Bats. Additionally, the bat transformation ability that Crissaegrim affords Alucard is still available to him as long as the sword is physically on the same plane of existence as he is, whether it is sheathed or not. So he can use the Cloud of Bats reaction ability even while in wolf form.

Multiattack. The wolf makes three melee attacks: one bite attack and two claw attacks, the latter of which can enjoy the benefit of the target having the "prone" condition if the target fails its strength saving throw after the bite attack.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 18 (2d8 + 8) piercing damage. The target must succeed on a DC 14 Strength saving throw or be knocked prone.

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 6) slashing damage.