This patch was made to run a c1-c2 l2off server with CT 2.5 Freya client (216 protocol). It has all content from C2 client.
List of features:
Game world transferred from original client (zones are same with c2 client, you can run a multi-protocol with older client if you want to).
Has built geodata.
C1-C2 items support with original stats and descriptions.
C1-C2 monsters are supported with their original IDs
C1-C2 skill descriptions.
Recipes aligned to c2
Quest descriptions and item requirements changed to old ones.
Removed unused quests (from c3+), added c2 tutorial quests for each race. Since most quests on c1-c2 have only 1 description state, quest info won't update as progress through the quest unless you implement these states yourself from server-side.
Kamaels removed.
Character creation outfits are changed.
Lobby has been changed to C2 one (moon looks kinda buggy though)
Interface slightly changed (no cp and vitality bars, no ssq info on the map)
World info tab adjusted to C2 content.
Splash screens changed to C2.
Loading screen changed to C2.
p.s. it won't work with clean c1 pts server. You have to upgrade network packets for 216 protocol to make it work (same work Smeli did in the past).