Raid
Raid entries, tiers, the companion and where the rewards come from.
Basics
The Raid unlocks after chapter 5 and is open on Tuesday, Thursday, Friday and Sunday (UTC). You fight alongside an AI companion through 19 difficulty tiers. The raid map changes every raid day.
Daily entries
You get 1 free entry every day, and a few extra entries are available on top.
You can use Change Companion to get a new companion list once a day.
Rewards
A raid pays from three places: chests along the way, the guardian (it drops from the same item table as Boss Battle) and extraction at the end. Most of the reward comes from the guardian and extracting, so finishing the raid matters more than picking up every chest.
Your first raid is practice: tier advancement starts with your next raid. After that, clearing the raid with a fast enough guardian kill time can move you up one or more tiers automatically, while losing or leaving before the guardian is defeated can cost you a tier. The Raid also has a weekly leaderboard, and its weekly reward pays by your best tier that week.
The first Boss Battle, Raid or Mythic Maze win of the day also gives a free Sweep Ticket.