WARNING:
REQUIRES THE STEAM OVERLAY TO BE ENABLED FOR THIS GAME.
IF YOU CANNOT ENABLE THE STEAM OVERLAY, THIS DLC IS NOT USABLE.

The functionality of this DLC uses Steam's Invite feature.
It appears that this feature requires your profile's Privacy settings to be set to "Friends Only".
If setting your privacy to "Friends Only" is not possible for you, you should not purchase this DLC.

This DLC allows you to invite your Steam friends to play Custom Games.

Your friends do NOT need to own the DLC in order to accept your invitations.

Also, when starting Custom Games, you can choose Picked Draft (where each player selects what units they will play with) or the regular Random Draft, where armies are randomized for each battle and each unit can be re-rolled once.

The Steam Overlay needs to be enabled for the game, in order to invite friends to play. The Overlay can be configured in the Steam Settings menu.