d30 Physical Features for Tieflings

Or roll one of those alphabet-dice
 in case of #5 (by Danny Cicchetti)

Roll a few times on this or just choose.

1. horns (d6= 1: young goat sized/ 2: Icelandic goat-like/ 3: water buffalo like/ 4: ibex like/ 5: springbok-like/ 6: antlers)
2. same as 1.
3. d6= 1-4: nasty, big, pointy teeth/ 5-6: teeth grow in rows as a shark
4. tusks (d6= 1-3: small/ 4-5: boar-sized/ 6: World of Warcraft-troll-sized)
5. crest (d6= 1-3: parasaurolophus-like/ 4-6: tapejarid-like)
6. tail (d6= 1-2: 15-30 cm/ 3-4: 30-90 cm/ 5-6: 90-150 cm)
7. spiny backbone
8. shoulder spikes
9. prickles, quills or barbs instead of facial hair
10. complete lack of hair
11. d6= 1-3: skinflaps between fingers and toes/ 4-6: skinflaps between arms and torso
12. wings, non-functional and small, (d6= 1-2: bat-like/ 3-4: bird-like/ 5-6: insect-like)
13. no pupils
14. unusual eye color (use 6d10's to generate it randomly here)
15. eyes (d8= 1-2: catlike/ 3-4: sheep/ 5-6: reptile; 7/ chamelon/ 8: insect)
16. unusual skin color  (use 6d10's to generate it randomly here)
17. feet are (d6= 1: catfeet/ 2: hooves/ 3: tortoise feet/ 4: crocodile feet/ 5: crow claws/ 6: lemur feet)
18. polydactyly (on a result of 5-6 on a d6: 7 fingers instead of 6)
19. d6= 1-3: hands of that of a aye-aye/ 4-6: fingers have more joints than usual
20. small hands located at torso (can only hold light items)
21. eyes instead of niples
22. exhalations are accompanied by small wisps of smoke
23. faint smell of sulfur
24. character heats up and glows when angry
25. glowing unholy symbol at forehead
26. for every being killed by character, a metal ring/tattoo appears on character's body
27. snake tongued
28. goat eared
29. d6: 1-3 octopus beak; 4-6 fly mouth
30. feelers

The hands of an aye-aye,
by Joseph Wolf

tapejarid crests
by Danny Cicchetti

The Disease Domain for 5e clerics

Be the pestilence you want to see in the world.

Disease Domain Spells

Cleric Level - Spells
1st - Detect Poison and Disease, Ray of Sickness
3rd - Blindness/Deafness, Ray of Enfeeblement
5th - Bestow Curse, Stinking Cloud
7th - Blight, Confusion
9th - Contagion, Insect Plague

Seneschal/Steward of Sickness

Starting at 1st level you are immune to the effects of diseases but can still carry them.

Channel Divinity: Count/Countess of Contagion

At 2nd level you can use your Channel Divinity to touch a creature and infect them with one of your carried diseases, even if it normally can not be transmitted through touch. This ability acts as Contagion, but can only inflict diseases that you carry and has a duration of 1 hour.

Channel Divinity: Marquis/Marquise of Maladies

At 6th level you can use your Channel Divinity as a bonus action to make a creature susceptible to diseases. If a chosen creature within 30 ft. of you fails a Constition Save (DC is your spell save) it gains disadvantage on it's next save against disease or vulnerability to necrotic damage the next time it gets hit with necrotic damage.

Duke/Duchess of Disease

At 8th level, you gain the ability to infuse your weapon strikes with divine energy. Once on each of your turns when you hit a creature with a weapon attack, you can cause the attack to deal an extra 1d8 necrotic damage to the target. When you reach 14th level, the extra damage increases to 2d8.

Viceroy/Vicereine of Virulence

Starting at 17th level, any creature starting it's turn within 10 feet of you must succeed on Constitution Save against your spell DC or contract a random disease carried by you.

The Sea Domain for 5e clerics

Here's a custom domain for your 5th edition clerics, for if the Tempest domain isn't your god's deal.

Sea Domain Spells

Cleric Level - Spells
1st - Create or Destroy Water, Swim*
3rd - Conjure Vessel*, Gust of Wind
5th - Water Breathing, Water Walk
7th - Control Water, Evard's Black Tentacles
9th - Conjure Elemental (Water only), Drown*

Bonus Proficiency

When you choose this domain at 1st level, you gain proficiency with vehicles (water), heavy armor, the trident, and Strength (Athletics) checks. Heavy weight (including armor) won't hinder you while swimming and can't drag you underwater unless you choose so.

Channel Divinity: Master of Water

Starting at 2nd level, you can use your Channel Divinity to charm creatures with a water theme and turn creatures with a fire theme.
As an action, you present your holy symbol and invoke the name of your deity. Each water or fire related creature that can see you within 30 feet of you must make a Wisdom saving throw. If a water themed creature fails its saving throw, it is charmed by you for 1 minute or until it takes damage. While it is charmed by you, it is friendly to you and other creatures you designate. If a fire themed creature fails its saving throw, it is turned for 1 minute or until it takes any damage.

Blessed Lungs

At 6th level your god turns you amphibious. You now can breathe air and water.

Strike of the Crashing Waves

At 8th level, you gain one superiority die (a d6) and know the Pushing Attack and the Trip Attack maneuvers.
When you reach 14th level, you gain one additional superiority die and the dice increase to d8.

Avatar of the Ocean

At 17th you can transform into a Water Elemental once per long rest. This functions as a druid's wild shape.

New Spells:

Swim

1st-level transmutation
Casting Time: 1 action
Range: touch
Components: V, S, M (a cup of salt water, which needs to be consumed by the target)
Duration: 1 hour
The touched creature gains a swim speed equal to their land speed and automatically succeed Strength (Athletics) checks to swim in rough water.

Conjure Vessel

2nd-level conjuration
Casting Time: 1 action
Range: 3 feet
Components: V, S, M (a ship in a bottle)
Duration: 8 hour
You summon a boat suitable for coastal and river navigation. It can carry up to 8 medium sized creatures and disappears after 8 hours. If this spell is cast again before the spell is ended the duration is extended by 8 hours.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you summon a vessel suited for open sea travel complete with (non-combatant) ghostly crew.

Drown

5th-level necromancy
Casting Time: 1 action
Range: 30 feet
Components: V, S
Duration: Concentration, up to 1 minute
You fill the targets lungs with seawater.
The target must make a Constitution saving throw. On a failed save, the target starts suffocating for the duration. At the start of each of the target’s turns before the spell ends,
the target must succeed on a Constitution saving throw or continue being suffocated. On a successful save, the spell ends.

5e Background: the Manipulative Advisor

Once, you were the real power behind the throne. By careful manipulation of diplomats, merchants, and royalty, you exerted your influence over the land. However, your web of lies and deception was exposed and you were banned, imprisoned or defeated in combat. In the latter cases you escaped or fled. Particular wise advisors might have snuck away before things got bad.

Skill Proficiencies: Deception, Persuasion

Tool Proficiencies: Disguise kit, Forgery kit

Equipment: Disguise kit or Forgery kit, a set of once-fine clothes, a smoke-contraption*, and a belt pouch containing 10 gp or a gem worth 10 gp.

d6 You once advised:

1. A corrupt government
2. A doddering old king/queen
3. A ruthless, literal monster
4. A vicious idiot
5. A credulous philanthrope
6. A self-centred hedonist

Feature:  Kafkanaut

You walk with such confidence and know the right words to say in bureaucratic and royal places (or  other places of political authority) that no one will question your presence. You can command and bully servants and low-ranking clerks without problem in such places.
Most rulers are at least willing to listen to your advice and take it in serious consideration.

d8 Personality Trait

1. You know what is best for everyone and you are not afraid to tell them.
2. You know that the best way to stay alive is to keep your opinions to yourself and observe from the shadows.
3. You express your ideas in such ways, people think it was theirs.
4. You see people as pawns and love playing with them.
5. You’re a great fan of dramatics. Nothing like a well-placed sinister laugh!
6. You always have a back-up or escape plan.
7. There’s this nagging doubt that selecting the Charlatan background might fit your character better. You’re not sure though, and this doubt will haunt you forever.
8. You lick up and kick down.

d7 Ideal (If you want to use a d8, use the Soldier’s #6 Ideal as 8 in this table.)

1. Greater Good. You have lied and deceived people, but it was all to increase welfare for the common people. (Good)
2. Anarchy. The system is corrupt and ruling bodies can be best toppled from the inside. (Chaotic)
3. Equality. Those born of blue blood are no more deserving to rule than any other social class. (Chaotic)
4. The letter, not the spirit. Laws and traditions are nothing more than playthings and tools. You will use any loophole to your benefit. (Lawful)
5. Power. It feels good to rule and no one is more fit to rule than you. (Evil)
6. Guidance. Anyone not doing their job to the fullest can be advised and taught to be an exemplar of their occupation. You are here to help. (Good)
7. Opportunism. The ignorant and the gullible are here for you to take advantage of. (Evil)

d6 Bond

1. You still desire to regain your lost power over the region you once controlled. Next time, however, your rule will be felt by everyone.
2. The land you once protected from its delusional ruler is still in the ruler’s greedy claws. You owe it to the people to dispatch this insane despot.
3. Since you were disposed, several innocent people were put to prison
4. You fell in love with the relative of your former ruler and would do anything to see them again.
5. You’re still indebted to one of your associates who helped you flee the country.
6. The person who exposed you is still somewhere, alive, mocking you. Revenge must be yours.

d6 Flaw

1. You have a “tell” (a brooding demeanour, sneering eyes, a mirthless smile, an obvious name) which certain kinds of people (plucky heroes, loose cannon bodyguards) can use to recognize your manipulative nature. 
2. The agents of your former country are still after you.
3. Your willingness to wait several years before your well-crafted plan reaches fruition could easily get on your companion’s nerves.
4. You are convinced of your intellectual superiority.
5. You like to complicate social schemes.
6. You research all your options before committing to a plan, even when you need to act on time.

*Smoke-Contraption
This item could be a bomb, a fragile crystal with whirling clouds in it, a magical egg or something else. It can be thrown up to 20 feet. Smoke spreads from the point of impact within range to fill a 15-foot-radius sphere for 2 rounds. The smoke spreads around corners and counts as a heavily obscured area.