15D weapons are very powerful but hard to get.
You can get 15D weapon by completeing The Burning Abyss Collection. You don't need to take the quest. For collecting talismans you need to go and complete our custom Forgotten World dimension.
In order to get there you will need to buy a Dimension Hole from Special Shop, located in Jangan
Dimension Holes are 4 grades, and the count of the stars at the name is the grade. The higer the grade - the higer the reward. 1st grade may drop one talisman, 2nd grade - two, 3rd grade - tree and 4th grade - four. All grades have same drop ratio and it is 20% chance to get drop.
Talismans are being dropped from Treassure Boxes.

Talismans you need for the collection are eight:

You can activate talisman by right clicking on it and it will open in your collection book. When you open any of the talismans the quest will be obtained immediately.
Collection book can be seen from here:

When you have all eight talismans in your collection you have to go in Hotan and complete the quest The Burning Abyss Collection from Hunter Associate Ahmok.

You can't get european weapons with china character or china weapons with european character
If you use one-handed weapon (blade, sword, warlock rod, cleric rod, one-handed sword) and you need shield you should collect talismans second time for it

15D weapons and shields can be customized with D15 weapon[Type *] and D15 SHIELD[Type *] which costs 1 000 silk and can be bought from .::D15 Style Store::. located in Jangan.

On those links you can see different skins and choose which one suites you best:

Chn and Eu shields have the same outlook:
Shield