Preserving Attribute Strength

Talk (twice) to Magic Trader Holly in the Grocery Store. She will send you to Attribute Manager Yin who is standing near the forge.
Yin will give you Attribute Master's Sword (male), which adds 10 attribute to fire elemental attack. This sword is shadow for 10 minutes, regardless of whether it is equipped or not. If you don't manage to complete the quest before the sword disappears, talk to Yin again - he will give you a new one. This is an A-grade sword, you can use charges (Soulshots and Spiritshots).
Your first task will be to bring 6 Reckless Soul Piece - Water (Sign of the Future: Orc). Kill the mob Reckless Sprite of Water (lvl 76) to get quest items. You can find these mobs under the bridge on the way to The Cemetery, they are not aggressive or social. The quest item Reckless Soul Piece - Water (Sign of the Future: Orc) will be given to whoever makes the final blow with the Attribute Master's Sword.
When you bring 6 Reckless Soul Piece - Water (Future Sign: Orc) Yin, he will send you to bring more

6. Before sending, he will give you a buff for 10 minutes Blessing of Fire (+20 to fire elemental attack). If you return to him for a new sword, the buff is also updated.
As a reward you will receive 2 Rough Ore of any element of your choice (Fire, Water, Earth, Wind, Holy, Dark). These stones cannot be thrown away or sold.

1 Walkthrough of quest 1.1 Option in Town of Aden 
1.2 Option in Rune Township 

2 Sources