Physics and RoTK??!

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Originally Posted by Roa_Aoife

Maybe the tower is made from the same minerals which make up the Earth's crust, or other such rock which doesn't melt upon contact with lava.

Okay; surely there's precedent. But just how far up the tower does that heat radiate? And what does it do to any local water supplies (i.e. groundwater), or do orcs drink poison?