Five Dawncrest tiers exist in Midnight Season 1, each tied to a specific gear track and ilvl ceiling. Every item is locked to its own track - a Champion item can't be pushed into Hero territory by spending more crests. The track is fixed when the item drops.
Adventurer Dawncrests upgrade gear between ilvl 224 and 237. They come from outdoor content, Prey Hunts, and low-tier Delves - easy to cap weekly without dedicated farming.
Veteran Dawncrests cover the 237 to 250 bracket. Sources include LFR raids, Heroic dungeons, Hard Prey Hunts, and Delves at tiers 5 and 6.
Champion Dawncrests push items from 250 to 263. These come from Normal raids, Mythic dungeons, Mythic+ keys at +2 and +3, Nightmare Prey Hunts, and Delves at tiers 7 and 8.
Hero Dawncrests cover 263 to 276. You earn them through Heroic raids, Mythic+ keys at +4 through +8, and Tier 11 Delves.
Myth Dawncrests are the top tier, upgrading Myth track gear up to 289 - the Season 1 ilvl cap. They drop only from Mythic raids and Mythic+ keys at +9 or higher.