Ok after a little bit of research here is what I've found contributions are welcomed :
Asala :
- serrated GS blade (canyon tomb in the hissing wastes) craft with iron for fluffyness, craft with everite for effectiveness.
- Masterwork Crescent GS grip (random loot/cheat engine/cradle farm)
- Ornate Pommel (random loot ?)
Ageless/Ewigkeit :
- Wide Greatsword
- curved greatsword grip / Masterwork jeweled GS grip (alternative)
- decorative pommel (BUG: Does not display properly) / firm pommel (alternative)
- Rune of cleansing required for extra darkspawn killing
Yusaris :
- Masterwork Engraved Blade (silverite)
- Broad Greatword Grip
- Engraved Pommel
- A rune of dragonslaying is fitting
Griffon's Beak :
- Anderfels cleaver w/ silverite (war table mission)
- Wrapped 2handed haft
- sharp pommel
- best served with a rune of cleansing
The summer sword :
- Firm Greatsword blade (silverite)
- Masterwork Ornate GS grip (farm/cheat engine)
- engraved pommel (suggestions for improvement welcomed)
Blade of mercy (fenris restricted) :
- balanced greatsword
- Butterfly GS grip
- Etched Pommel
Also note : Sten sword grip is a longsword grip so it does help for asala 