Rose: Use build grist to construct observation tower on roof
Ok, you obviously don't have enough grist yet for something that ambitious. But you can get started with something of a foundation for upward construction, at least.
Hey check it out. Every week we'll be revealing some new troll characters from Hiveswap until Act 2 is out. Follow the Troll Call here, and meet the first two here. Expect a few more surprises like this to drop in coming weeks.