I love all the detail in the third panel, especially the picture and the "cave sweet cave" plaque above the door.

Now for some wild speculation:
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What if Durkon's father didn't die in the cave-in? Maybe he was buried alive with the dracotroll, and they couldn't dig him out without releasing the creature. Sigdi could be feeling guilty about having to leave him there. Is there any way that he could possibly even still be alive after all this time and that is why she never remarried? Probably not on that last part, but I don't know anything about dnd to know if it's possible.