Double rates will be in full effect for crafting, levelling and rates etc.
When you're at a PVP event such as War of thw Worlds, Guild Village War, Capture the Flag or Sacred Stone you'll gain rested at a whopping 10x speed! So get yourself to the events.
All monsters that give you stats will drop letter bags and using them will give you a random letter. These letters can then be made into a word. For example if you have a T, 1 E's, an O and 3 R's you'll spell Terror which Meister Spell will give you a reward for.
Find them all out and you'll harvest some great rewards.
There's just one letter that can't be deciphered, collect enough of them and something will happen.
Remember letters will only drop from monsters in your stat range! Enjoy.
Have a great Halloween!