Decorative Molten Jetpack and Fused Gauntlet are new items which can be acquired by completing new dungeon Molten Facility and achievement from the last chapter of the Flame and Frost series – Retribution.
You can preview the items in the PvP Locker. Completing the meta-achievement for Flame and Frost, “Alliance Breaker“, awards you a Fused Gauntlet Ticket. Use this item to exchange it for your choice of Fused Gauntlets, a unique exotic item. Completion of this achievement requires all of the other Flame and Frost achievements except “A Rallying Flame“.