Okay cool.
I mean 100 feet is pretty big.

That's a lot of climbing. So they'll need jetpacks... How about a small group of them (one of the hero characters involved?) starts climbing up the Threat to get to the top. They do climbing jumps, all sorts of treachery in the ridiculous climb until they get to the shoulders. Then, the face shifts and becomes a giant mouth with giant tentacle tongues that just swallows the rest of them up. (Maybe start out with ten, have like two by the time they get to the shoulders)