A new subclass begins at level 40 and keeps shared character possessions.
Complete the subclass prerequisites, including Mimir's Elixir. A new or replacement subclass begins at 40. Raising a subclass to 75 unlocks further choices, up to three subclasses total. Inventory, warehouse, clan and PK information are shared. Active skills, buffs and symbols follow class-switch rules. Elf and Dark Elf paths cannot be combined; Overlord, Warsmith and equivalent-class choices have restrictions.
C5 raised both main-class and subclass caps to 80; this applies to Interlude. Main-class status is required for Olympiad competition.
Mimir’s Elixir starts with Magister Ladd on the fourth floor of the Ivory Tower and requires the Star of Destiny from Fate’s Whisper. Speak with Wesley in the basement for Supplier of Reagents and the Mixing Urn. Prepare the reagent collection before returning to Ladd: the Pure Silver step needs materials from that mixing system, not a normal weapon-crafting recipe.
The safe single-output route uses 100 Moonstone Shards, 10 Volcanic Ash and 2 Quicksilver. Mix ten batches of Moon Dust from 10 shards and 1 ash each; combine 10 Moon Dust with 1 Quicksilver for Lunargent, then 1 Lunargent with 1 Quicksilver for Pure Silver. The Pure Silver step requires temperature 1. Do not confuse this with the higher temperature used for the final elixir.
Deliver Pure Silver to Ladd, then visit Joan on the third floor. Her Sage’s Stone objective sends you after Chimera Piece; return the stone to Joan for True Gold. Continue with Ladd, obtain Blood Fire from a Bloody Guardian, and combine Pure Silver, True Gold and Blood Fire in the urn at temperature 3. Return Mimir’s Elixir to Ladd to complete the subclass unlock.
Replacing an existing subclass starts its replacement at level 40; it does not transfer the old subclass’s levels to the new profession. Your shared possessions remain, and a character who already earned Noblesse keeps that status when replacing a subclass. Check class-combination restrictions and the weight restriction before making the switch.