Taste of Blood

When in range of 5 ft of a creature that is bloodied or dead for no longer than 1 minute and can bleed: Once per Long Rest you can use your Bonus Action to lick their blood. If you do so, roll a d20 to determine the effect

1:

You dissolve into a Pile of Blood for 1 minute.
Pile of Blood: You can not take any actions, but when you move into another creature's space, it must succeed a DC 15 Dexterity save or take 1d6 acid damage. You have resistance to all damage. You get +2 to AC. Your hit points and saving throws stay the same.

2:

You throw up violently and end your turn immediately.

3:

You start bleeding from your eyes for 1 minute: You are blinded. Before a creature makes an attack roll against you, it must make a DC 15 Wisdom save or be frightened of you until the end of its turn.

4:

Your neck grows long and thin like that of a Vulture for 1 minute. You gain resistance to poison damage. But for piercing and slashing damage targeted at your neck, you are treated as vulnerable to those.

5:

For the next 1 minute, along with its blood, you also consume a fraction of the creature's weakness: The lowest Ability Score of the creature is transferred to you, along with its damage vulnerabilities. You instantly know the creature's weaknesses; what the creature is afraid of and all the bad things that happened to it in the past 1 year.

6:

You start bleeding from your mouth and ears for 1 minute: You are silenced and deafened. You can use your Bonus Actions to spit blood as a 10 ft attack roll, dealing 1d6 acid damage on hit.

7:

You instantly vanish into the 7th layer of hell, suffering 1d6 psycic damage and ending your turn. At the start of your next turn you reappear at an unoccupied space of your choice inside 30 ft. of the  spot where you vanished.

8:

You grow a snout like a bloodhound for 1 minute. You get advantage on perception checks relying on smell. Also, get blindsight of 10 ft. 

9:

For 1 minute, toss a coin after each of your turn. On Tails, you can decide where you want to teleport inside 30 ft. On Heads, the DM does.

10:

For the next 1 minute, you look like an exact copy of the creature that you just consumed blood of. Your voice, mannerisms and mimicry are also identical. You know everything the creature has experienced in the past year. Every creature that was/is allied with it, must succeed an DC 15 INT save before it can hit you with an attack roll. If the save fails, they have to attack another creature instead or waste their action.

11:

You grow teeth like a Hyena for 1 minute. You can use your Bonus Actions to make an Unarmed Strike, dealing 1d6+STR mod piercing damage on a hit.

12:

 You become invisible for 1 minute. It ends if you make an attack or cast a spell.

13:

You grow eyes like Mosquito for 1 minute. You gain Truesight and Uncanny Dodge, as you move like an insect.

14:

You grow the head of a shark and fall into a blood frenzy for 1 minute. You Rage like a Barbarian of your level would and you must take the attack action every turn. You can breathe underwater.

15:

For the next 1 minute, along with its blood, you also consume a fraction of the creature's power: The highest Ability Score of the creature is transferred to you (even if it's lower than yours). If the creature could/can cast spells: you can cast one of its spells, once (DM decides, which). If it couldn´t: DM decides what benefits you gain, if any.

16:

You grow teeth and tail like a rat for 1 minute. You gain the effect of the reduced spell. You can Sneak Attack as a Rogue equal to your level could.

17:

Your body starts burning like a devil. Wherever you go until the end of your next turn, you create a 5 ft thick, 20 ft high fire wall in your path behind you (on the ground, not in the air). Creatures that enter the wall or end its turn there take 3d6 fire damage or half on a successful DC 15 Dexterity save. The wall lasts for 1 minute.

18:

You grow wings like a Bat for 1 minute. You gain a fly speed equal to your walking speed.

19:

Yourself and everything you wear and carry becomes red and dripping of blood for 1 minute. When taking damage, you can use your Reaction to dissolve in a Pile of Blood as described under nr.1. You can use your Bonus Action to return to your normal form.

20:

You grow horns like a Devil for 1 minute. You emanate a 15 ft aura of terror. If a creature enters the aura or starts its turn there, it must succeed a DC 15 Charisma save or fall prone. Prone creatures can only move by crawling inside the aura.