Andy's reward was trash (Jawbone Cap unique), but we got a Catalyst
Tried to catch the explanation in s/s but in case it's not clear:
Any unique item + Catalyst in cube = 1 Arcane Shard
5 Arcane Shards in cube = Arcane Crystal
What are Arcane Crystals?
They are used for Crafting items, Creating Unique items, Upgrading items.
Game has ITEM TIERS. Tiers 1,2,3,4, Sacred (with uniques, also Super Sacred and Super Super Sacred which are rare as fuuuuuck)
2 Arcane Crystals + Any Magic item = Tiered Unique Item of the same type.
so yes, all the TIERED uniques can be created manually, but sacred+ cannot.
Tier 1 item + Crystal = Tier 2 item, up to Tier 4.
TL;DR
After you find 10 shitty unique items you don't need, game basically rewards you with an option to create a Unique item you want. This works only with Tiered (aka shitty) uniques, and recipe does not apply to end game items and their creation.