At another place described by this adjective, Lancelot cuts a piece of cloth from a dead knight the moment he feels a tremor.
The penultimate chapter of From Ritual to Romance offers the thesis that the frequent occurrence of this word is inspired by the heretical nature of Holy Grail legends. This word also appears in the name of a location that King Arthur passed through while enchanted by Annowre. In one story, a place described by this word is built by Queen Brangamore. In that story, that place is connected to a task that involves fighting a floating hand, a floating head, and the Devil. At another place described by this adjective, Lancelot cuts a piece of cloth from a dead knight the moment he feels a tremor. In addition to naming that aforementioned chapel, this adjective also describes a certain location occupied by Galahad, who first did so while he was so "tender of age." For 10 points, identify this adjective that describes a seat of the Round Table that gets its name because most people who sit in it will die.
The penultimate chapter of From Ritual to Romance offers the thesis that the frequent occurrence of this word is inspired by the heretical nature of Holy Grail legends.
Perilous [accept any of Chapel Perilous or Forest Perilous or Siege Perilous, accept any of those with the word order flipped, prompt on any of those locations such as "Chapel" or "Siege" or "Forest." Finally if any one spells it, and it's a bit bastardized, take it, because there are many Old English variations of this word]