Do you have any lore bits for Grim? I just realized that we barely know anything about him
How he came to be is similar to Lion in canon, except Dan found him already dead and a pile of normal wolf bones. Dan had been given a bottle of Lizzy/Rose’s healing tears/spit by the hermitcraft/life series rebels and was taking it back by foot to the Sub-Zero/Shady Oaks rebel’s temple because the warp pad was under repairs. Keep in mind, Dan wasn’t AS accustomed to the concept of organic death, decay, and preservation as a human would be, so he got distracted by the bones, ambushed by a corrupted Quartz, and accidentally dropped the tears, which seeped into the ground along with his own spit from the fight, reviving the dog into a sort of animate skeleton with the soul making up the rest of the body. Once he took care of the Quartz, a tiny bit of corruption essence mixed into the dirt, which made Grim into a big ass direwolf, and Dan didn’t realize what the hell he just made until it literally followed him back to the temple and scared the shit out of everybody else. Lizzy’s spit/tears reanimated him, but it was diluted, as opposed to Dan’s being direct, which is how Grim ended up not fully alive with flesh and just undead. And blue.
Like Lion, he also has that hammer space in his fur. It would look a lot different, though, probably a blue-ish wisteria tree and some hydrangeas. Dan doesn’t keep near as much stuff in there because he’s worried about losing it, instead letting Justin carry most of it in his Pearl. If anybody keeps stuff in Grims fur, it’s most of the team, though whatever they do keep in there, they secure in a box or something because Grim not being fully alive means stuff falls out a lot easier. If any of them gets poofed, they typically throw anybody but James in there until they get back home. James can’t stay in there because he’d sufffocate. Same no-oxygen rules apply with Grim’s space. The point of entry is just his underside and the thick fur around his head, so if anyone needs something, he just rolls over.
Grim came perfectly trained upon being revived, so the group assumes he retained at least some of the memories from before he died and that he belonged to somebody before, but that somebody’s long gone. He doesn’t remember who they were, at all.