Getting a tail without having to open a few hundred iron lockboxes would be good, so even just one tail that could be found as a rare drop would be fabulous. Also, a toxic themed tail would suit my new costume I'm looking at making.

"They could be a very rare prize reward from Gloaming Wildwoods?
Or just Snarbolax?"
With an increased chance in a Shadow Lair?" Great Idea. But the prizebox thing would be kinda lame for people who don't want to pay real money for It.

"For the rabid snarbolax tail, you could have to run through shadow lair for the material, and use Nightmare Manes and Snarbostuffing to craft it. The shadow snarbolax tail and the Regal Snarbolax tail could be rare drops, the regal one being acquired from both Shadow and normal versions of the boss."

Yes. These are neat Ideas. :)

TRUTHFULLY, I feel all Shadow accessories with the Snarb-red color should be prismatic, Snarbolax set included.

Shadow theme already has it's own set of colors, and the prismatic aspect would just be a better fit in my opinion.

BUT REGARDLESS, we've been clamoring for a Snarbtail since accessories came out, and we have a great need for them. I wouldn't personally mind makin' them craftable with the Nightmare Mane, so long as the other Shadow Lair armors get somethin' to match.

P.S. I like how ya have a set of six eyes for the emote, that's clever!