Zoglin Rock/Kill field

Ruined portals are not really much of a sign other than enchanted gold gear and iron. So how about there is a rare chance that where there is a ruined portal there will be a huge area made of stone. There will be a cave there housing three zoglins in it and a bunch of other zoglins on the outside. If you go in this cave there are deep trenches at the end that reach bedrock and there will be a bunch of skulls there. It is not creepy though because minecraft is not creepy without a texture pack or playing a horror map. You can go here and get a lot of mob droppings because the zoglins keep attacking. I thought of this because me and my friends are making a seed (using /fill command and just building on it. And because there were so many mobs because I needed to use command blocks to make mobs spawn in their habitat I put zoglins all over the seed to control the amount of mobs. But they stayed in one chunk and now I was thinking I could make this idea. It will be surrounded with stone and a big chunk of stone will be in the center. Zoglins will patrol this area.