History of First Ascent

First Ascent is a five-piece Legendary Armor set from The Final Shape, sourced from The Pale Heart, for Hunter, Titan and Warlock (helmet, arms, chest, legs, class item; see First Ascent Helm).

Acquisition

After the seventh campaign mission, Iconoclasm, Micah-10 offers quests at computers in the Pale Heart. Per Destructoid, early objectives unlock arms, legs and class items, and after Ghost search quests and "Alone in the Dark", the chest and helmet plus a Deepsight Harmonizer. It is a post-campaign grind. See The Visitation.

Set perks

• Stack 'Em Up (2 pieces): defeating targets with unique elemental damage gives a stacking bonus to Transcendence energy gain while Transcendence is inactive.
• Burn 'Em Down (4 pieces): while Transcendence is active, using your grenade consumes all Stack 'Em Up stacks for escalating grenade energy.

Four pieces suffice, leaving an Exotic slot.