All quests in theory need to be completed, because in the GM shop everything is sold for expensive.
Buff duration

: 2 hours.
To check online type:
.online
To change language type:
.lang
Check drop from mobs or RBs via Shift + Click selecting the target.
Maximum enchant on gear, jewelry and weapons +50.
Enchant chance 60% on weapons and 65% on armor.
Bonus Rune gives +100% experience, adena and resource drop chance. And + a couple % enchant chance.
Detailed description in game from NPC Birius.
+10% Matk from Ring of Core.
+8% Mdef from Earring of Orfen.
If you are killed, 2% to 4% of adena from your backpack will drop.
If you have less than 5k adena - nothing will drop.
Party rates:
XP in party = +20% more for each player in party.
SP in party = +20% more for each player in party.
It's more profitable to level in party by 20% for each player in party, than solo.
There is an in-game menu (ALT+B).