How to Get the Cracked Keystone Quest
When doing Tier 11 Delves, there is a chance you will loot a Cracked Keystone from the rewards chest at the end. Doing so will start the quest, Cracked Keystone.
This quest brings you over to Mythic+, where you must complete any Mythic+ dungeon at keystone level 2 or higher. Many players should have received a Mythic Keystone from their Great Vault. If you did not, talk to Lindormi in Silvermoon City, located next to the dungeon portal room.
You can choose to host your own Mythic+ group or join one from the Group Finder. After completing any Mythic+ dungeon, you can turn in the quest from your quest log, no NPC required.
The reward for this quest is 20 Hero Dawncrests and 20 Myth Dawncrests that do not count towards your weekly crest caps. This is a tremendous source of early, high-value Dawncrests that can be used to craft and upgrade high item level armor.
