Legendary Backpacks

This article is about an achievement category called "Legendary Backpacks". For a list of legendary backpieces, see Legendary back item.

Legendary Backpacks is a category of Collections achievements. Currently, the only two legendary back item in this category are Ad Infinitum and Orrax Manifested.

To unlock and complete the necessary collections for the Ad Infinitum, players must increase their personal Fractal Mastery. An NPC in the Mistlock Observatory, Kelvei, the Legendary Observer is wearing the completed backpiece and will provide players with hints about each item when asked.

Ad Infinitum stages: Finite Result (First step), Upper Bound (Second step), Unbound (Third step), and Ad Infinitum (Final step)

Orrax Manifested was introduced with the Absolution release launched on June 3, 2025.

Legendary Backpacks (Collections)	Total achievements: 5	29
Ad Infinitum I: Finite Result	6
Collect all 11 fractal components.Unlock all 11 fractal components to work towards building the legendary fractal backpack. Prerequisite: Talk to Kelvei in the Fractals of the Mists. Unlock Item:   Theory of the Finite Result Reward:   Proof: Finite Result Suggested Locations: Lion's Arch Collection	Collected 1 Fractal Components	1
	Collected 5 Fractal Components	2
	Collected 11 Fractal Components	3
Ad Infinitum II: Upper Bound	6
Collect all 11 fractal tier 2 components.Unlock all 11 fractal tier 2 components to work towards building the legendary fractal backpack. Prerequisite: Ad Infinitum I: Finite Result Unlock Item:   Theory of the Upper Bound Reward:   Proof: Upper Bound Suggested Locations: Lion's Arch Collection	Collected 1 Fractal Tier 2 Components	1
	Collected 5 Fractal Tier 2 Components	2
	Collected 11 Fractal Tier 2 Components	3
Ad Infinitum III: Unbound	6
Collect all 11 fractal tier 3 components.Unlock all 11 fractal tier 3 components to work towards building the legendary fractal backpack. Prerequisite: Ad Infinitum II: Upper Bound Unlock Item:   Theory of the Unbound Reward:   Proof: Unbound Suggested Locations: Lion's Arch Collection	Collected 1 Fractal Tier 3 Components	1
	Collected 5 Fractal Tier 3 Components	2
	Collected 11 Fractal Tier 3 Components	3
Legendary Backpack: Ad Infinitum	6
Collect all 13 fractal tier 4 components.Unlock all 13 fractal tier 4 components to work towards building the legendary fractal backpack. Prerequisite: Ad Infinitum III: Unbound Unlock Item:   Theory of Ad Infinitum Reward:   Gift of Infinity Suggested Locations: Lion's Arch Collection	Collected 1 Fractal Tier 4 Components	1
	Collected 5 Fractal Tier 4 Components	2
	Collected 13 Fractal Tier 4 Components	3
Legendary Backpack and Glider: Orrax	5
Bind the legendary backpack and glider Orrax Manifested. Prerequisite: Salvation's Cost Collection	Bound Orrax Manifested 1 Time	5

---

Collections achievements

Categories	Basic Collections Rare Collections Specialization Collections Legendary Weapons Legendary Backpacks Legendary Armor Legendary Trinkets Festival Collections Black Lion Collections
Other achievement groups
Daily Character Adventure Guide Bonus Events Festivals Story Journal General World vs. World Visions of Eternity Janthir Wilds Secrets of the Obscure End of Dragons Path of Fire Heart of Thorns Side Stories Player vs. Player Raids Fractals of the Mists Collections Strike Missions Historical