If you haven't checked out the major patch notes in official forum, you can have a look at it here:
1.Witchblade class has been added.
2.Social Network feature (Facebook,Twitter) added.
3. Additional social actions have been added.
4. New Dungeon Selection UI has been improved.
5. "Adventure Book" content has been added.
- What is Adventure Book?
- Adventure Book is a content which players can check their achievements. The achievements can be obtained from each dungeon or in the villages by completing or gaining certain materials.
- Opening "Adventure Book" window
- "Adventure Book" window can be used by pressing the (H) hotkey button or by clicking the 'magnifying glass' icon in the dungeon selection screen.
- "Adventure Book" Reward
- When a player reach or gain a certain Adventure title, players can earn rewards such as legends. It can also be mounted. With the players adventure score, players can exchange certain items from the warehouse NPC.
- Depending on the difficulty of the adventure rating (gold, silver, bronze), scores adventure scores may be given differently. Some legends may not provide optional status.
- When a player meets the conditions of certain adventure information given, the achievement will be given automatically.
- If the conditions; specific title (level, pvp rating, etc.) of the adventure is already completed, complete the adventure by selecting the check box.
6. In the upper right of the minimap, a button to set a secondary password has been added.
7. In the Arena, the UI to distinguish the opponent player’s network latency has been added.
8. When a consumable holystone is broken, the system notification message has been changed to red prints.
9. Players can display their flag of their country in the character and guild information.
10. In the arena mode, lobby has been improved to be updated every five seconds.
11. The exposure of the NPC balloon has been added.
12. The UI for enchantment of items has been reorganized.
13. The UI for class change promotion has been improved.
14. In the guild house, the feature that players can open their own warehouse inventory has been added.
15. The durability of the items which cost less than 1 gold has been changed.
16. Billing module for cash items (dual coin-P, C) has been added.
17. Live World Systems has been added.
- NPCs talk more about C9 scenario, the hidden story, system description and a dialogue which is appropriate to your situation.
18. The crack of dimension feature (Shield boss monsters) has been added. Shield boss monsters will ONLY appear in the dungeon below.
- 2nd Continents: Henko Crater (Master)
- 3rd Continents: Soul Valley (Master)
- 3rd Continents: Ice Valley (Master)
- 3rd Continents: Elquines Shelter (Master)
- 3rd Continents: Lunard’s Fallen Castle (Master)
19. The number of text limitation has been improved to 128 characters.
20. The font has been changed to Times.
21. "Key Setting" option has been added.
- Players can change their key configuration to their own needs.
22. Intro video for 1~3 continent has been added.
- The video for 1st and 2nd continent will be ran ONLY after completing certain quests.
- The video for 3rd continent will be ran at the first entrance of the 3rd continent.
23. Skill balance has been changed. (Specific Status will be notified)
24. For administration, volunteer right has been added.
- Positioning - NPC
- Move - move the town, move to mission
- Difficulty (0: Normal 1: Hard 2: Expert 3: Master 4: The Nightmare)
- Boarding or (1: enable 0: Disabled)
- Move - to move to specific coordinates
- Management - Observer mode, View Character (character level + equipment and property settings).
25. The Social Action commands will ONLY be activated by typing “/” button before the command.
- Hi -> /Hi
26. Overwolf features have been added.
- Overwolf features will be available after reinstalling the C9 OBT client.
- Overwolf is a module providing voice chat, video recording, SNS for sharing.
- URL: "http://www.overwolf.com/
27. The color of the Named monster (Blue) and mid-level boss (Orange) has been changed. The drop possibility rate of Named monster (Blue) has been improved.
- General Stage mid-level boss monster added.
- General Stage mid-level boss monster drop rate improved.
- Improve mid-level boss drop (secret box): Connect the level 6 element stone to secret box.
28. The status for unique items has been improved.
29. Ventilation missions and quests have been added
Sneak & A[size=9.0pt]ssassination Mission
Sneak & Disguise Mission
Hunting Battle with NPC Mission
30. The class change experience video has been added.
- Class change experience scenes have been added to the story.
31. Progress of the tutorial has been changed.
- After achieving “Success” by typing in the correct command, the tutorial progresses.
32. In tutorial, learning skill videos has been added.
33. Skipping feature for tutorial has been added.
- Players can skip tutorial by pressing "ESC" button.
34. The progress of the village tutorials has been changed.
35. Repeated quests that can be received from the skill trainer have been added.
- Skill combo repeated quest (level 1 to level 20) has been added.
36. Bulletin Board has been improved.
37. Master Level of reward has been improved.
- If you receive a good ranking in the master difficulty, special beads will be given.
38. Good ranking beads has been added in the master difficulty.
- Excellent "E" in the upper right corner of the display, Perfect “P” on the top right corner of the display (The default beads did not changed)
39. Additional Arena features has been added.
- Arena class room in the creation of conditions have been added.
- Ranking window in the PvP Arena (Arena class, ranking PvP rank) has been added.
- Automatic game ready (Auto game preparation until the game starts) has been added.
- If a moderator does not start after 30 kkjseconds, other players ability to force to change a moderator.
40. Community Window (instant messaging) feature has been added.
- Existing community window has been improved. (Players can chat at the same time)
- In the messenger window, right-click menu "Join the party" has been added.
- Sound has been added with the incoming messages.
41. General Merchant is selling portable equipment repair tool items.
- Players can repair equipment by using a portable repair tool items.
42. Repurchasing feature has been added.
- The maximum number of sales: 12
- NOTICE: The list of sold items will disappear when players change channels, connecting arena, character selection and etc.
43. Install items for Guild House has been added. (two kinds of rentable guild houses)
- The required level to rent a guild House changed from Level 3 and Level 9 to Level 6 to Level 13)
- The message box for Guild Items Storage has been improved
- Installation of baroque guild houses item has been added.
44. Arrows UI added to direct beginners at Goblins Forest, Underground Goblins Altar, Imp Forest, Imp-Infested Minen, Delpast Front, Ruined Seashore Village, Meshurian Heights.
Source: Official Forum