Working on a mod named Chasm of Fate, I need some suggestions!

boss: A Massive ghoul monster that summons zombies.

If you want take insiration  from my construct of undead boss, he flies and summons zombies

How about a new ore called shadium, witch should also make some awesome helmets that have horns? oh, and how about another boss called "Galdiache, destroyer of lives" pornoce Galdiache (gahld-ee-ek)

and he should drop horns of infinity witch slows you down, gives you forever life, fire resistance and blindness! that's cool!

Chasm of fate makes it sound like something very sinister deep underground. I was thinking maybe a huge purple tentacle monster boss or something? It could spawn in a huge cavern/chasm deep under ground.

make a parasite that takes away your abillity to do sertan things eg jumping sneaking sprinting attacking

The shades the shades are many Mobs that are invisible only knowing its existance by Its smoke once you get close you are blided and slowed and then withered and after a while die 

Some of the shades don't do that some mimic animals like cows and pig the once you get close it becomes a shade that Will attack you  if you see a farm animal Its a trap and some shades fly and don't give you the effects being invicible if Its near light level 7 it Will start taking damage 

Thats my idea