Ragnarok Mobile: Eternal Love just released the episode 5 and you can enjoy tons of additions in their latest update including the 3rd jobs breakthrough. Max job level for 3rd job is 40/40 and with the recent update you can unlock them until job 60. Unfortunately, you cannot use Peak Shards and you'' be using new item called Breath of Death or BoD.
Breath of Death can be obtained through following:
To increase your job level you need numbers of BoD, refer to the table below.
|Job level||Purification level||Amount|
Total 180,000 Breath's Death
The proceed with the quest you need to go to Umbala field. (South of Morroc)
That's it. You can now take quest from The Misty Forest and obtained BoD.