The SuperCow

Mysterious and mooing, one of the Cow Gods has given you power in exchange for being magically compelled to serve their interests. 

Choose a Cow God that suits you.

M-µ(muh-MOO): Goddess of milk and healing.

Moo-Moo-Moo(BAHB): God of thievery.

FartLord(FAHRT-lohrd): God of farts and creator god.

MooMoomooMoooooMOOmooµMOOmoooo(XZXZXCNZMXVNZXMCZCNZMXNCMZNXMN): God of unpronounceable names and king of the gods.

Expanded Spell List

 The following spells are added to the warlock spell list for you to more efficiently serve the SuperCow. All Hail the Mooing Ones.

SuperCow Expanded Spells

Spell Level	Spells
1st	speak with animals, bane
2nd	enlarge/reduce, alter self
3rd	animate dead, bestow curse
4th	arcane eye, conjure minor elementals
5th	geas, creation

Milk Drinker

Starting at 1st level, when you drink 1 pint of milk, you gain temporary hit points equal to your Charisma modifier + your warlock level(minimum of 1). You can do this a number of times equal to half your warlock level(minimum of 1), recharging 1 spent use when you take a long rest. 

Cow Lord's Form

Starting at 6th level, you can call on your patron to grant you great power. When you roll initiative, you can use this feature to enlarge yourself(as with enlarge/reduce, but with 1d6 extra damage instead of 1d4) into a giant cow-person. This lasts until combat ends.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Leather Skin

At 10th level,  your patron gives you some of their characteristics. You now have tough, leathery skin like a cow.

You have the benefit of leather armor when you don't have armor on. in addition, you have resistance to bludgeoning, piercing or slashing(your choice when you gain this feature) from nonmagical weapons.

Bludgeoning

You have resistance to bludgeoning damage.

Piercing

You have resistance to piercing damage.

Slashing

You have resistance to slashing damage.

Spectral Cow Head

You have a spectral cow head, which stays within 30 feet of you and acts on initiative count 20(losing ties). It can take one of the following actions(your choice) per turn:
FUSE: The cow head becomes corporeal and replaces your head. You deal an extra 1d6 + your Charisma modifier + your warlock level psychic damage each time you hit a creature with an attack. You also have truesight for a radius of 60 feet.
KILL: The cow head fuses with an opponent of your choice within 30 feet of you. The opponent takes 1d6 + your Charisma modifier + your warlock level psychic damage and is incapacitated until initiative count 20 on the next round.
BLAST: You cast eldritch blast(with the number of beams equal to your Charisma modifier). All targets must be within 30 feet of you. This is not affected by invocations.