Once you get the Noble Sword, go west, then north to the stump. Step on top of it and change the season to Winter, then head west. Get back on the stump and change the season to Autumn, then go south. Get back on the stump and change the season to Spring, then go east. Then pop on the stump and change the season to Summer, finally moving north. You'll reach a field of Armos Statues. Keep heading north and climb the stairs, up to another Mystical Tree. Go to the east from here and change the season to Autumn. Go back to the west and move the mushrooms here, then torch the small tree. Follow the stairs down to find a chest. Inside is a Gasha Seed.
Go back to the right and get on the stump, changing the season to Winter. When it's cold, go south, then head to the right. Burn the row of trees here, then head north until you reach a path through the snow mound. Once you get atop it, head up the stairs, then to the left. You'll reach a small stump blocking a bridge to the west. Since you can't get past it, move the bottom of the two Armos Statues to the right, exposing a notch in the cliff. Jump down from here into the valley below. Get on the stump and change the season back to Spring, then hop on the Spring Flower to catapult up to the ridge above. Follow the bridge across to the entrance to the Dungeon. You will be confronted by Twinrova, who will cackle and get spooky, then disappear. Head into the Dungeon
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