Vampire form:you take the form of a vampire. You gain 10 additional damage, 50 extra health, 6 extra armor, creative flight and night vision. You also gain access to draining bite, mist shroud, mist warp, summon swarm and dark storm. However you burn in the sun as if your shadow was stolen.
Draining bite:your next unarmed attack does 20 extra damage, you also regain health equal to the damage dealt. The target suffers from slowness 2 and mining fatigue 2 for 15 seconds.
Mist shroud:you create a shroud of red mist around yourself. Anyone who enters this mist suffers from weakness and blindness for 5 seconds.
Mist warp:basic teleport move
Disclaimer:the following two moves are entirely my suggestions, as while they haven’t been shown in the game that the fruit is from they are abilities used by Bram Stokers Dracula, so the fruit should possibly have them.
Summon swarm:you summon a swarm of vampire bats to attack nearby enemies. Each bat is sort of weak but can quickly swarm the target.
Dark storm:you call down a storm of lightning bolts on all enemies within a certain radius.