When Zelestine drinks from the well, the glow increases momentarily then fades away, along with the image of the eye. The psychic warrior turns, a glow now appearing in her eyes, "That was envigorating. I feel a sharpening of the senses. Surely a benefit to the drinker's Wisdom. I am sorry that you did not gain the benefit, Groknar."
Returning to the main chamber, you see that two of the plates are now lit (one with three parallel lines, the other with the eye).
Four doors remain. Choose one.