I was waiting for this to drop since this page. 10 degrees warmer every day for a week? That's +70° already. I don't know what degrees they use in the Rustyverse, but if we assume (for the readers' convenience; just like why everyone's speaking in English) that it can be mapped to real-world units, then... if it's centigrade degrees the basement is already a place where you can't survive for long; if it's Fahrenheit degrees it might still be survivable but it'll be swelteringly hot. The moat is being drained (its water probably seeping into tunnels dug by attackers), and there's the mysterious moving fungus that might be used as a sort of spying device (well within the possibilities of an enemy druid).