Sheath Knight - ElWiki
First Class Advancement
Elsword is required to be Lv15 to begin his first class advancement.
Eliminate 15 of the Bomber Mongs in 2-4 on any difficulty.
Defeat 14 Jangos and Kid Phorus on 2-4 Hard or above (☆☆).
Talk to the Accessory Shop Owner in Elder, Ruichel.
Complete 2-4 on Very Hard (☆☆☆) within 15 minutes.
After completing the Knight quest chain, Elsword can decide between advancing as a Sword Knight, Magic Knight, or Sheath Knight.
Talk to Hoffman in Elder.
Clear 2-3 on Very Hard within 10 minutes (☆☆☆).
Clear 2-4 on Very Hard (☆☆☆).
Collect 1 drop from Wally No.8 (Boss) from 2-5 on Very Hard (☆☆☆).
this is for kr elsword, i would assume its the same in tw