A short rundown of how the key mechanics actually work on L2 WarNeT — no quest grinding where it isn't needed.
On our server, Noblesse status is granted without a quest. Find the Noblesse NPC vendor — you need to be level 52 with 350 Gold Bars in your inventory, trade them in and you'll receive the Noblesse Tiara. Gold Bars can be farmed in-game or bought in the shop.
Subclasses are also quest-free here (AltSubClassWithoutQuests). Talk to the Villagemaster of the relevant race and pick "Add Sub-Class" — the only requirement is your character level. You can take up to 5 subclasses, and unlike classic Interlude, they level up to 80 instead of 75.
The mechanic is standard Interlude: bring a level 46+ weapon and the right tier Life Stone to the Blacksmith of Mammon. The chance of getting an active skill on the weapon depends on the stone tier — higher tier means better odds and a brighter weapon glow.