Rift Keys

Where keys come from and the orbs that work on them.

Keys

A key has a tier (1-15) and up to 3 modifiers. Modifiers on a drop: 1: 50%, 2: 35%, 3: 15%.

The modifiers make the rift harder and raise its rewards: quantity, rarity, experience, at most +80%/+75%/+60% (raised by tier IV and V modifiers).

Source	How
Finished rift	30% + 10% per modifier (at most 60%) for a next key; 50% + 10% per modifier of those are one tier higher.
Rift monsters	Rare 2%, legendary 6%: a key of the rift's tier.
Monsters	Tier-1 keys: 0.05% per kill (Normal x1, Magic x3, Rare x8, Legendary x20, Boss x40) from monsters of hunting level 60 or more and at least 40% of yours.
Bounty board	Tier-1 key for a finished contract: hunt 25%, elite 50%, boss 100%.

Orb	On a key
Orb of Awakening	Gives a Rift Key without modifiers one modifier.
Orb of Gilding	Gives a Rift Key without modifiers two or three modifiers.
Orb of Grafting	Adds one modifier to a Rift Key (three at most).
Orb of Unmaking	Removes one random modifier of a Rift Key.
Orb of Erasure	Removes every modifier of a Rift Key.
Orb of Upheaval	Rerolls the modifiers of a Rift Key (one to three new ones).
Orb of Fate	Rerolls the values of a Rift Key's modifiers inside their ranges.
Orb of Tempering	Rolls the values of a Rift Key's modifiers again inside their ranges.
Orb of Excision	Removes one modifier of a Rift Key.