One painful defeat is a poor shopping list. Aion 2 separates PvP and PvE damage coefficients, and NC has adjusted both class balance and Abyss equipment over time. An item that looks impressive in a dungeon may not solve what keeps killing you in your chosen PvP mode.
Diagnose the fight
Were you caught alone, unable to reach a target, or defeated after your defensive tools expired? If so, positioning and skill timing may be cheaper improvements than a new piece of gear. If you consistently survive but cannot pressure anyone, then compare upgrades that address your actual damage window.
Check mode-specific limits
Chaotic Upper Reshanta arrived with caps on item level and combat power. Spending heavily to push a statistic beyond a mode's effective limit is an easy mistake. Keep a written list of the modes you play, the requirements each one displays, and the next upgrade that matters there. Recheck after patches; an Abyss build is a working plan, not a permanent receipt.