Tir Asleen fields[edit]
There are only two places worth a visit, both along the West edge of the "town" ("ranch" or "farmstead" seems more appropriate). The southern one directs Willow to his next destination, the northern one fully restores Willow's health and magic points.
Po's magic ocarina allows to fly here. Therefore, if Willow reached level 13, fly to the Daikini bar, cross the lake, and talk to Fin Raziel. Afterwards, use the ocarina again and come back here.
Fin Raziel transformations: opossum > crow > goat > ostrich > tiger > crow again (loop).
Rocky mountain[edit]
This area is to the north-east of Tir Asleen. Climb the mountain, defeat some monsters, and talk to the old woman. This is necessary to enter Tir Asleen castle.
If you try and explore the cave at the mountain foot, an empty chest blocks a passageway right now.
Tir Asleen castle[edit]
Tired of the caves? At long last, this is a proper dungeon in the style of the Legend of Zelda! In fact, remember that this Willow game is a Zelda clone.
Ground floor[edit]
If you meet Airk, he says clearly that the boss is in the next room. Explore the rest of the castle first.
There are two stairs that lead to the same upper floor, and one that leads to the dungeon. The latter is featureless, therefore go upstairs.
Upper floor[edit]
Find the two chests and upgrade Willow's sword and shield.
BOSS: Eborsisk[edit]
After upgrading Willow's equipment, go down to the ground floor, to the south-west room near Airk.
Just parry the fireballs with the shield and slash at Eborsisk, and it will go down.
Dungeon[edit]
After defeating the Eborsisk, Willow falls into a cell in the dungeon. If he steps on a hidden switch along the southern wall, a secret passage will open. Navigate the dungeon (that is far smaller than the other two floors) and leave the castle.