Okay, picture a mountain made of living rune-stone that decided to stretch and move: that's how I think of grór. Up close, its signature power is seismic sovereignty — it can split the ground, raise stony ridges like a chess player moving pawns, and focus tremors into pinpoint shocks. Alongside that, it has a kind of gravitonic insistence: grór can increase local downforce so opponents feel twice as heavy, or reverse it briefly to send things skittering off cliffs. There's also this surprisingly clever ability to 'speak' through stone — small earthquakes act like morse code, letting grór coordinate with caverns, redirect mineral veins, or send warnings through buried allies.
Physically it's a tank: dense carapace of layered rock mixed with crystalline veins that channel its power. It regenerates slowly by absorbing nearby minerals, which means long fights favor it unless you deny that resource. But it's far from invincible. High-frequency vibrations — whistling metal, focused sonic cannons — destabilize its crystalline lattice. Intense, sustained light or thermal surges can make its crystals spall and crack, because the heat breaks the bonds between the layers. Its gravitic manipulations are local and consume a lot of internal coherence; if you force it to maintain them across distances, its other abilities start to stutter.
On a more human note, grór's attunement to the land is both a strength and a liability. Take it away from rock and soil — dump it into a deep ocean or a skyscraper-filled city with no bedrock to speak of — and it gets sluggish, disoriented. I've used that trick in campaigns: lure the big, slow one onto a metal bridge and use resonance to peel its armor. It's majestic, lumbering, and strangely sympathetic when you realize its 'home' is its soul.