Level 45 Warrior quest bug

There is a bug in the Warrior level 45 job quest in which i can not complete it, this occurred when i discard the artefact gear and it cannot be obtained again (not even through the calamity salvager) so the quest cannot be finished or abandoned.

Time:All
frequency: All the time
Character name: Vermillion Alice
Race: Au Ra F
World: Odin
Area:Costa del Sol
Class:Warrior level 50
Solo
Npc Name: Curious Gorge
In-game time: All
Steps: Get the Fighter's armour then discard it

Specs: Irrelevant