Death's Apprentice

About
This is one of the rarest redblock mobs, with having 80 <3. It can only be found in the spawn village at night and has a 2% spawn rate. They have yellow fangs and when they attack you, it gives you the blindness effect and withers you for 10 seconds, aditionally, they will deal 4 <3. Due to them being 10 blocks long, 2 blocks wide and 5 blocks tall, this is one of the smallest dragons,

Summoning
Due to them being even rarer than endermen, a redblockian villager one day accidentialy summoned one of these beasts. You must aqquire 5 diamonds and put them into the chest in the mausoleum. The Death's Apprentice will spawn behind you.