How to get to Frontier Mountains
In order to get to Frontier Mountains (EoK) you'll first want to travel to Scorched Woods, you can get there through Lceanium. You'll find the zone line for Frontier Mountains in the eastern portion of Scorched Woods. This is the most common route to get to Frontier Mountains and during the EoK expansion the only route.
After Ring of Scale launches on your server, you can take a much faster route to Frontier Mountains. Take the Guild Hall portal to The Overthere and use succor/evac to be taken down to the southern zone line to Frontier Mountains.