The Arcane Pinnacle[55.9, 12.2] is where Archmage Xylem's trials take place. From here the Trial of Fire, Trial of Frost and Trial of Shadow take place.
During the initial quest to reach the top, if a player gets blown off the cliff, there is a jump gate at [55.4, 14.9] that will put you back up where the initial Image of Archmage Xylem is located.