without going down tower? you go through Aqua Road take all the maps going left, you will hit the bottom of the tower. You can get to aqua from ludi elevator that leads to korean town then down the Well or from dolphin in Herb Town
Go to Orbis, enter Orbis tower. Keep on down jumping until the Orbis Wing Symbol on the top left corner is replaced by a Snowflake. Then use a return scroll and you should be in El Nath. Your minimap must be in the largest form for you to do this.
Just down jump to like the 8th floor (or whatever floor you start to see ice everywhere) and use a town scroll. Long time ago you couldn't even use a town scroll while in the tower so you're lucky now.