Could I use the action from spell Dragon’s Breath in all following rounds I casted it while within duration and concentration?

Is the “Explorer’s Guide to Wildemount” considered Official Dungeons&Dragons material?

“With the Explorer’s Guide to Wildemount announcement…” by Matthew Mercer

With the Explorer’s Guide to Wildemount announcement… from r/DnD

What is the typical wardrobe for someone in the Cobalt Soul?