At every floor in the keep there was a scroll. Lundar made each of the professions read it, and it turned out that every profession got a different message. He deciphered it in the order of mystic, healer, fighter. Here is the deciphering made by Lundar.

1th floor
"...crystal shines... ...complete star... ...the path..."
2nd floor
"...my efforts... ...miserable failures... ...to return life..."
3rd Floor
"...secret to prevent... ...diseased minds... ..eludes me..."
4th floor
"...to continue... ..need more fresh... ...healthy bodies.."
5th floor
"...intelligent behavior... ...mere instinct... ...only semblance..."
6th floor
"...transfer mind... ..eternal life... ...dispose of body..."

See also the sketches and the full tale.