Vines are a common element found in Ghoulhaven Hall that both serve as an ingame interactive feature and as a design characteristic.
All closed doors in the mansion are barricaded with thorny vines sprouting from the surface below. Those vines can also retreat below without any marks left on the floor/ground. Every time Cooper enters a room, the door he previously went through, vines will immediately rise out from below and cover the door, as well as every other door in the room except the door Cooper must enter. If Cooper touches the vines, he will be hurt and lose 1 point of energy. Ghoulies will also react in a similar manor, but don't lose health like Cooper does. All vines are green except for the ones on the Baron's quaters which are thinner and colored purple.