Ethereal Credit

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Ethereal Credits are tokens used to buy various items from an Ethereal Soul-Trader.

Source
To obtain a credit, you must first summon your Ethereal Soul-Trader which is done by using the. The beacon is a reward from Landro Longshot in Booty Bay, as part of the Trading Card game.

Once the Soul-Trader is summoned, you must kill players or NPCs which are no more than nine-levels below you. For example, if you're a Level 70 player, you will not obtain a credit for killing a Level 60 player or NPC.