Recently I discovered this after flipping a jungle to an egg field in bonadventure.
This description suggests that these Eggs are incubation baby imps, and I think that it be cool if these 200 deep tiles occasionally spawned imps. Conversely if infused to 200 good to spawn sprites in the enchanted forest or whatever too.You are standing outside of Cape Bonaventure. This is a wooded area whose ground is composed of dark shards of shale and flint. There are thousands of dark-colored, egg-shaped objects growing from the trees. Their surface is leathery and translucent, and within can be seen the shadow of an imp.