Raids allow you to instantly go through the previously cleared locations of the campaign and the dungeons, and get a reward as for the real play.
Raid tokens for locations and dungeons are different, and you can get them in prizes for points in Regatta.
The raid button will appear when you first receive tokens. The amount of gold and dropped items may differ slightly from the actual play in the location.
To open the crystal chests will still need a partner.