Monster: Eye Deer

 Eye Deer (this is a bad name, if you use this give it a better name)

A gaunt deer with bone white antlers and a single giant eye on the front of its head.

Stats (going to be very general, nothing too specific)

Health: weak but can still take a few good hits, Speed: that of a deer, Defense: slightly better than unarmored 

Attacks

hoof slam: d6 damage (or whatever is considered average damage for a weak creature)

Wicked antlers: d8 damage to all in front of it and roll a d6, on a 1-2 it takes that much damage and it loses its antlers (or whatever is considered above average for a weak creature_)

Unnerving stare: anyone who makes a head on attack must make a mind/will/intelligence save and if you fail you are unnerved and waste that action

Vulnerable eye: when attacking it head on all attacks have a 50% chance of hitting the eye causing double damage, blinding the deer (use your games blinded rules), and spraying black icore on all in front of it causing them to drink the icore. If the eye is undamaged at the end of the fight you can harvest it, it has 4 doses of icore in it


Drink the icore

roll a d10 and add your con/fortitude/body to it and consult the table bellow 

1- make a con/fortitude/body save, on failure you die, your blood turned into 2d6 doses of icore, otherwise you lose 2 con/fortitude/body as your body is warped and twisted 

2-6 you become addicted to the icore, each day you must drink a dose of icore or you must save against gaining a mental disorder, if you go 3 days without icore you are cured of this addiction, each time you gain this you gain +1 to this con/fortitude/body check

7-12 you gain a brief bit of understanding, you must you must save against gaining a mental disorder and if you succeed then you gain +1 intelligence/mind, each time you gain this you gain +1 to this con/fortitude/body check

13+ strange insight fills your mind, if you are addicted to icore you are no longer addicted, you may ask the dm any one question which they must answer truthfully, you gain a large bonus to your intelligence (or any other similar stat) but your flesh is twisted and weakened, lose a large amount of strength (or its equivalent) and your eyes fuse together and grow into one large eye on the front of your head, the eye has the same properties as the eye deers eye.