Must eat to sustain your body mass. Eat once a day and one additional time for each form you’ve obtained. Failure to do so will cause you to be afflicted with Hunger. Disadvantage on attack, action, saving throws, and –5 to AC. Eating will cause you to regenerate 1D6, however, eating preferred Diet food will regenerate 3D6 Hit Points.  

Slimekin can easily morph their bodies to fit many uses. Shield an ally, squeeze into small areas, disguise yourself, the list goes on.

Your naturally innocent appearance makes it hard for others to distrust you. Your proficient in Persuasion and Deception. 

If specifications are met the Slimekin will gain a form to accommodate for their surrounding environment. Forms can not be removed once obtained and only three can be gained maximum.

Requirement: Take or Deal 200 Bludgeoning Damage
Rock Solid: Resistance to all Bludgeoning Damage
Rough Terrain: Melee attacks the successfully hit you will take 1D10 damage
Weighted Down: Permanent -5 to Movement
Diet: Vegetables

Requirement: Take or Deal 200 Slashing Damage 
Blade Work: Resistance to all Slashing Damage 
Sharpened Skill: Proficiency in all Bladed Weapons 
Single-Minded: Disadvantage using any other weapon 
Diet: Bladed Weapons

Requirement: Take or Deal 200 Piercing Damage 
Bulls-Eye: Resistance to Piercing Damage 
Call to Arms: Gain the Hail of Thorns spell as a Cantrip
Keep Your Distance: Unable to use Melee Weapons
Diet: Arrows. Bolts, Bullets, ect

Requirement: Take or Deal 200 Fire Damage
Inner Flame: Resistance to all Fire Damage
Pyromaniac: You can use the Scorching Ray Spell once per long rest without using spell slots
Soaked: Weakness to Water and unable to cast Fireball while wet
Diet: Metals

Requirement: Take or Deal 200 Cold Damage 
Blizzard: Can use the Ice Storm Spell once per long rest without using Spell Slots. Point of use is casters current position.  
Snow-Bearings: Once a minute, you may create a Snow Berry that gives the consumer Cold Resistance for 1 Hour. 
Fragility: Vulnerable to Bludgeoning Damage.  
Diet: Fruit

Requirement: Take or Deal 200 Lightning or Thunder Damage 
Amped Up: +15 Movement
Discharge: Can use Lightning Bolt once per long rest without using Spell Slots
Hyper-Active: Must remain in motion during combat, failure to do so will cause player to take 2D6 Lightning Damage

Requirement: Take or Deal 200 Poison Damage
Poison Body: Immunity to all Poison Damage and Toxins
Radiation Control: Gain Ray of Sickness as a Cantrip
Radiated Body: Creatures touching you must make a D20 saving throw or become Radiated. 
Diet: Vegetables

Requirement: Take or Deal 200 Force Damage
F5: Ride a Cyclone doubling your movement
Vortex: Gain Dust Devil as a Cantrip
Eye of the Storm: The wind around your body makes it difficult to use projectiles. Unable to use Ranged Weapons
Diet: Fruit

Requirement: Take or Deal 200 Psychic Damage 
ESP: Resistance to Psychic Damage 
One Hundred Percent: Can use the Phantasmal Killer spell once per long rest without using Spell Slots
Mind Over Body: -2 to Strength  
Diet: Vegetables

Requirement: Take or Deal 200 Radiant Damage
Glass Body: Resistance to all Radiant Damage
Shiny Shiny: Gain Chromatic Orb as a Cantrip
Fragile Instability: On any Roll of 1 summon a Glittering Fireball that attacks one random creature with 1D8 Fire Damage. Vulnerable to Bludgeoning Damage 
Diet: Vegetables

Requirement: Take or Deal 150 Explosive Damage
Demolitionist: Resistance to all Explosive Damage
Retaliatory Explosion: When an enemy strikes you roll a D20, if they roll above 15 you explode dealing 3D10 Exploding Damage in a 10ft Radius around you. This can only be done once per enemy turn. 
Short Fuse: Take Disadvantage on next attack roll after exploding. 
Diet: Meat

Requirement: Take or Deal 300 Melee Damage
Feral Ferocity: If your attack would miss, you may attempt to attack again. 
Go for the Throat: You gain a Bite attack that deals double your Hit Die in Bleed Damage
Prehistoric: You've returned to your primitive ways, lose -2 Intelligence. 
Diet: Meat

Requirement: Take or Deal 200 Necrotic Damage 
Ravenous Rainbow: Can use Evard's Black Tentacles and Contagion once per long rest without using Spell Slots. (Contagion works on creatures Restrained by Black Tentacles)
Gluttony: Now must eat twice as much as you previously had to.  
Corrupted Mind: On an attack roll of 1 regardless of Modifier, you must make an attack roll on an ally as if they were an enemy.  
Diet: Everything

Requirement: Land killing blow on 30 Creatures
Feline Grace: Gain the Featherfall and Jump spells as Cantrips
Kitten: Easily Distracted, -1 to Wisdom
Diet: Meat

Requirement: Devour 30 Unique sources of Meat
Pounce: Leap at an enemy within 30ft, make a contested Acrobatics roll. If successful you’ve knocked the enemy prone.  
Predatory Instincts: Proficiency in Stealth and Acrobatics 
Carnivore: Your diet is now restricted to only Meat. 
Diet: Meat

Requirement: Stay in Forested areas for 3 Full Days
Vines: You gain the Grasping Vine Spell as a Cantrip 
Photosynthesis: You gain 10 temporary Hit Points while in direct sunlight
Flammable: You are vulnerable to Fire Damage
Diet: Meat

Requirement: Spend 3 Full Days out of Sunlight
Luminescent: Can choose to emit a light from yourself that lights up 60ft
Illuminate: Enemies have disadvantage on attack rolls on you in sunlight
Sunlight Sensitivity: You have a disadvantage on attack rolls while in sunlight
Diet: Fruit

Requirement: Spend 1 Full Day in any Source of Water
A Drop in an Ocean: Naturally have Invisibility while submerged within water and 60ft of Movement
Water Body: Gain +2 to Dexterity
Shy: You are unable to attack when surrounded by 4 or more enemy creatures
Diet: Water

Requirement: Obtain 10 Unique Gems/Jewels
Crystal Shard: Melee attackers against you now take 2D8 of Damage
Geomancer: Can create 5ft tall Crystal Constructs in a 15ft line within a range of 10ft of yourself. (Constructs act as Cover)
Heavy Body: Permanent -10 to Movement
Diet: Gems, Jewels, and Treasure.

Requirement: Give or Receive 200 Healing
So Sweet: Heal yourself for 1D6 this does require a bonus action 
Sharing is Caring: Once per long rest, give a taste of yourself to an ally within 5ft of you. They receive 2d10 of Healing.
Tasty: Enemies find you extremely delicious and are prone to attack you above all else within 30ft
Diet: Fruit

Requirement: Acquire 10,000 Gold Pieces (Throughout the Campaign)
All That Glitters: All money you receive is doubled.
Diet: Gold

Requirement: Roll 25 Natural 20's
Jackpot: Now D20 rolls of 17, 18, and 19 are considered Nat 20
Diet: Gold