That treasure chest isn't worth it buddy! You'd better just turn around, head back down the stairs and leave that attic alone!!!
This short horror series had a lot of great covers, and here's another favorite of mine. Like many of the best, it's by Bernard Bailey. It's taken me quite a while to finally find a copy that was cheap enough for me, I just think the cover is a great image; I love the variety of monsters! I think my favorite is the hairy octopus-gorilla creature holding a spiked ball.