From September 17th, the Steel Lily set will be available through Diamond Pack recharge!
To gain the set, buy a Diamond Recharge pack worth $4.99 USD or more. (Time-limited packs do not count.) The set will be sent to your mailbox, where you can claim it directly.
Note: the makeup in the promotional picture is not included. It is the Extraordiary Elf makeup Queen of Deer Elf set.