I finally came up with a way to upgrade Slab (Ninjago 70655) I'm completely happy with. I didn't like the previous horns/blades. There's a bar now that runs through the head. Its
Amazon.com: Ninjago Dragon Pit Playset, Watchtower Jail & Viewing Gallery, Ninja Heroes Toys for Kids : Toys & Games
Dragon Pit 70655 | NINJAGO® | Buy online at the Official LEGO® Shop US