Nov 28, 2013 This slot is specifically for agony infusions, which is a new type of infusion introduced with this update that only goes into the Agony Infusion slot. Infusions from from previous updates cannot go into this slot. If you have infused your ring/backpiece before this update, you will have a +5 agony infusion already in this slot. An Agony Infusion is a type of Infusion upgrade item that can be added to the agony infusion slot of any infused ascended rings or backpieces to increase your Agony Resistance. If you want to place agony infusions in a defensive, offensive, or utility infusion slot, you have to use things like Versatile Simple Infusion.

A guide to obtaining the new ascended amulets and utility infusions introduced with the Flame and Frost Prelude patch.

Purchase

All of the ascended amulets, rings, and infusions can be purchased from the Laurel Merchant near the WvW gates in Lion’s Arch and also at major cities (look for the laurel symbol on maps).

Ascended Amulet

All of these Ascended amulets cost 30 laurels each, which are obtained from the daily and monthly achievements. Keep in mind that some amulets have 4 stat combinations and there are 3 items with identical stats except difference in the type of infusion slot (offensive, defensive, utility)

Utility Infusions

These utility infusions only go on ascended amulets currently as these are the only type of ascended gear with utility infusions.

Glided Infusion: +20% gold from monsters – 20 laurels
Magical Infusion: +20% Magic Find – 20 laurels
Experience Infusion: +20% experience from kills – 10 laurels
Karmic Infusion: +15% karma – 10 laurels

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Defensive/Offensive Infusions

These infusions can be brought for 5 laurels off the laurel merchant but do not come with any agony resist. Defensive/offensive infusions with agony resist are only crafted or brought from the FOTM dungeon vendor.

Amulet Enrichment Suggestion - Extra Slot — Guild Wars 2 Forums

Infusion	Slot	Stats	Laurels
Healing	Defensive	+4 Healing	5
Resilient	Defensive	+4 Toughness	5
Vital	Defensive	+4 Vitality	5
Malign	Offensive	+4 Condition Damage	5
Mighty	Offensive	+4 Power	5
Precise	Offensive	+4 Precision	5

Gw2 Adding Agony Infusion Slot