These critters can be found in caves where they dig deep underground finding old bones/fossils for their protection. They emit a strange oil-like substance which causes such items to stick to them.
Geckbone are shy so will search for a skull to hide their face in, accidentally causing other bone fragments to get stuck to their body while digging around. However if a Geckbone finds something/someone interesting, it will follow them curiously.
Skelamander undergo a change like Cubone/Marowak where the bones become part of their bodies upon mutation. Their goo becomes a lot more free-flowing, covering battlefields with it and causing opponents to get stuck. Once an opponent is slowed down enough, they charge in for a final snap of their strengthened bone jaws.
by Mysterious_Orcus