the holy grail, eternal life, and the monster without a name

It's never what's one might drink from the grail that's important, but the grail itself as a vessel.
Vessels. What could possibly give the eastward monster life, healing? The monster might crave a vessel that could sustain it indefinitely. Maybe the westward monster has found it, because what "vessel" could be so vast as to contain us and sustain us indefinitely if not the universe, present truth, acceptance, the heart broken open or the inside-out self?

A more tenuous thought: The monster looked for people who would give up their name and self... The association of the grail with Christ...