Lineage II/Coin of Magic-Royal Member

There are two separate quests that make up the Royal Membership quest; one quest to make you a royal member capable of getting the royal level coins and another that lets you cash in your royal coins (and a few medium grade coins as well) for A grade weapons.

Becoming a Royal Member
This quest requires that you have a level 1 membership from your previous coin questing, and are of level 55 or greater. Warehouse Keeper Sorint tells you to get a special Kail coin from the Forsaken Plains. Thankfully, you can cheaply teleport there from the Tower of Aden. Hunt Ancient Gargoyles, Fallen Orcs, Fallen Orc Archers, Fallen Orc Shamans, or Fallen Orc Captains to get Kail's Coin. With that, get yourself to Giran and talk to Jeweler Sandra, called "Trader Sandra" in the game. Buy the coin collecting book for about 11,000, if she will sell it to you. The most difficult part of this quest is waiting for the time that Sandra is in "a good mood" as Sorint told you, otherwise she will not sell. Keep coming back. Remember that although someone can buy as many books as they want, the items cannot be transferred to another character, so there is no way to buy a few for your closest friends.

Once you have the book, go back to Warehouse Keeper Sorint and complete your quest. About 45 Ancient Gargoyle kills will yield the Kail coin, and Sandr is always in a good mood every four hours.

Kail's Magic Coin
This quest comes from Head Blacksmith Vergara in Hunters Villiage. The reward is an A-Grade weapon recipe.

Getting the Coins
Although Vergara talks about finding Sorcerer Kail in his initial quest dialog, the only thing that needs to be done to get these coins is hunt the same mobs that were hunted before, except now they drop different coins. The coins can be picked up by hunting these mobs to get: These mobs are found all around the Forsaken Plains area in fairly high numbers. One interesting note is that if a Fallen Orc Shaman morphs into a tiger, they will not yield a coin. If you are playing in a party, trying to get the last hit on the mob doesn't matter in this case. Otherwise, to get the drop, like the old coin quest you need the last hit to have a chance of getting a coin.
 * Fallen Orcs: Kail's Silver Basilisks
 * Fallen Orc Archers: Kail's Gold Golems
 * Fallen Orc Captains: Kail's Silver Basilisks + Kail's Gold Golems + Kail's Blood Dragons
 * Fallen Orc Shamans: Kail's Blood Dragons