Dave’s land was literally a living hell for him, everything he never wanted to be near was there.
Another Knight, Karkat. He hated his land, due to the fact it was so filled with candy red, which was his blood color, something he has always hidden and would freak him out if anyone got close to discovering it pre-game. He couldn’t let anyone know or else he would be killed for it, resulting in him having both a natural dislike for the color and sort of freaking out if he saw it.
Both Knights had lands that were literal hells for them, one way or another. Now if only we had info on Latula’s land, then we could tell whether or not this is a constant for all Knights.