Hop Rock is a Fire Slug that is used as explosive ammunition. They are found in Quiet Lawn Cavern with Grenuker slugs, another explosive slug. When they are turned into Ghoul Slugs, they become Hop Jacks. Eli Shane owns one named Rocky who he won in a slug tournament and both Will Shane and Thaddius Blakk owned one.
- Sploder - A Medium sized explosion.
- Meta Mine - Lays a visible field of glowing proximity mines to stop slugs or opponents crossing the area.
- Scrapnel - Explodes in flight creating a burst of glowing hot shrapnel. (Eli congratulates Rocky on leveling up)
- Metal Shard - Explodes in mid-air shooting needle-like shards that trap an opponent against a wall.
- Hardball - Becomes a rock ball that hits the opposing slug.