relic +1 is the last thing you should do as a pld. It takes the longest to get compared to relic armor for just a small stat boost when you could spend 425-825 points on valor gear wich has much higher stat boost :)
+1 relic for pld is only 300 stones for shield (so that's actually the least expensive piece) and 600 for sword. Also for the legs, feet, body and head you need 2 peices to get the full benefit because in order to upgrade from 1 Dark light piece you need to downgrade the slot it's paired with to AK.
+1ing the sword also has the added benefit of killing stuff faster and getting you more hate.