Red temples are the only place to find red dragon eggs.
They are large temples in a pyramid shape made of Red Brick, with Glowstone climbing up the sides in a triangle pattern. Five large Obsidian columns rise out of the temple, one in the top center and 4 surrounding it. The columns have Netherrack blocks on top, which are on fire. At the top of the pyramid is a pool of lava with one Red Brick in the middle of it.
Location[]
Red temples are only found in the Nether.
Dragon Egg[]
To get the Dragon egg to spawn, you need to sacrifice ingredients into the lava pool at the top of the temple.
The items include 5 Blaze Rod, 4 Magma Cream, and 1 Nether Wart.[1]