Kevner's World has Tonka Og's tower as well as a medieval dungeon (Zentek's.)
Places to see on Kevner's World:
(0,0) Zentek's Dungeon
(11,14) Tonka Og's tower, but you must give your name to enter.
(5,8) Healing
(5,9) HQ
(6,8) Armory
(6,9) Transport to Andrini Cluster/Chronum/Kasdran