How Gargantuan is Iymrith?
My party is approaching the Eye of the All Father. I'll be skipping the artifacts, so on their way out this time, the encounter with Iymrith will occur.
My group uses a VTT (TabletopSimulator) and nearly always a square grid battlemap. 5e lists gargantuan as at least 20'x20'. I've seen some actual minis available on a 100mm base, which would generally match that size. I've also seen some made at the 150mm base scale, which would equate to a 30'x30' monster.
The Draconomicon has some measurements, but not sure how much those apply to battlemap miniature size. Red/Gold Dragons have a colossal size listed (no longer a 5e thing), so should it be assumed that they can get to the 30'x30' range (Klauth?) and that other ancient dragons should stay at 20'x20' on battlemap?
Should Iymrith be on the smaller end of ancient dragons because she is relatively young compared to others (google tells me her expected age is 900-1200 years, so barely ancient at all).
I plan on running Iymrith as a colossus fight (giving each part of the body an AC, HP, and Initiative). Wondering if anyone else has run her that way and any pointers for it. I understand it's ultimately my choice, just wondering what others have done or recommend.