Giant Sandworm - EXTREMELY TOUGH. Do not reccommend.
Shining Gargoyle - This is an easy resort for some and tougher for others. There are three ways you can go about this.
1.) If you have enough money, 100k or so since you're on Mari server, you can buy a spot in a Gargoyle Dungeon from another player. Be careful not to get scammed. Also finding someone who is doing the dungeon is very slim in chances.
2.) If you're pretty rich, (300-500k to waste), buy a Gargoyle Statue or the parts, and put them together. Get some friends together and run the dungeon.
3.) If you cant afford the above 2 options, then you'll have to run Maiz Normal dungeon and hope that the Gargoyle at the end will drop a Pauldron, Glove, and Boot. You have to hope that it doesn't drop a part you already have, or else you'll have to run it again. After running the Normal, you have to drop each part on the altar one at a time, doing one dungeon for each. The bosses of said dungeons will drop a Glowing part of their armor that corresponds to the part you dropped; I.E drop "Gargoyle Boot" and the boss will have a chance of ONLY dropping "Glowing Gargoyle Boot." This is a time consuming and very tough option.
Last option is to do the Boss Sketches. This is probably the easiest of all three options. You can just sit in Rano training or proffing weapons waiting for the spawns. You can also have guild members on other channels to keep a lookout for more spawns. This is my reccomendation.

IGN: Brutalitus