Scribblenauts Unmasked

No Evil Shall Escape My Sight

Easiest way to do it is to spawn a lot of "Green Lantern Corps" can also be found in the batcomputer icon if that is easier.
You might run out of room, so just reload the area and do it again.
After a while it should pop up.

Brains!

Write "Undead Plague"
Drop it in the crowd of Green Lanterns
Reload the stage and continue spawning Green Lanterns, then the plague.

1. Go to Atlantis (It costs 2500 justice league reputation points)
2. Write "Beast Boy"

1. Write "Lobo"
2. Write anything small (sword, ball, rock, etc.)
3. Add the addjective "Sepulcher black" on that thing.
4. Give it to Lobo