The Rock lion was one of the fan-made Rahi that was accepted into canon alongside Tahtorak, however its appearance was never canonized. It’s captured my imagination since though. A majestic lion powerful enough to defeat a Toa in battle, and all we knew about it was a name, and the fact that the tips of its mane could grow red hot! Well, no need to wonder anymore, here it is, in all its 400+ piece glory!
I also created a Matoran I named Lumune, with the hope of introducing both her and the Rock Lion (name pending, open to suggestions) to the BZPRPG, provided the mods allow it. Here they are together: