I had an idea for a biome for the end in one of my mods, but eventually minecraft had updated from minecraft 1.5 to minecraft 1.6, so I later wanted to play with mods and eventually found HEE. I had the idea to share the new biome to maybe be added into your mod. I was thinking of a dark biome with black grass on end stone. The grass could make dark particles coming from it. In the biome, it would have old destroyed obsidian towers. There would be a block of obsidian on the ground randomly throughout the biome. With your new mod I also thought of there being a rare chance of there being a huge obsidian tower that at the top would be some boss. For a boss I had always thought of something like an ender reaper. It would shoot out ender pearls teleporting you blocks away to fall off the tower. It could also have the ability to strike you with lightning. I thought of another feature such as summoning minions to attack you like mini Reapers who could only through ender pearls. The ender pearls thrown by the minions could be deflected, but the bosses couldn't. On drop thr reaper can drop his staff in hand and maybe a few eyes of ender or ender pearls.

Do you think you will use my idea?

I'm not planning to add any new biomes, but it's good to have some inspiration laying around.

:D