You find the NPC here:
Rewards:
The chest for 9 coins, you will receive 250 special marks
In the other chests for 25 coins are different titles , mounts and only 500 special marks
So the max you can get in the 30 days event are 750 special marks.
Daily quests to earn those coins:
Those are the rewards you can get for the special marks (3v3/6v6 NPC)
Thanks to Akimee for the screenshots
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