Move Granum void to their own mission with matchmaking.

[sam686]

To avoid most problems, just move Granum void into their own missions, maybe 3 of them, 1 for each tier, with matchmaking when set to public. Choose crown option can be like Neptune, the index. The missions will just require using a specific Tier crown to enter void. This will work best for a nice matchmaking.

The problem with optional Granum Void when matchmaking regular missions:
1. Players that entered Granum void are leeching regular, kuva flood, or nightmare mission reward from players doing nearly all the work that did not enter the void.
2. Players that did not enter Granum void will not get rewards from other players that completed Granum void.
3. Forced extract from other players in squad will force drag everyone out of Granum void with only minimal rewards, with someone's Granum crown wasted.
4. If 3 players entered void but 1 did not, forced to wait a very long time for players to get done and a player might quit with host migration interruption.
5. Matchmaking might join mid game into Granum void when I only want regular mission.

[ES-Flinter]

Granum crowns can be used in the same mission in which they were farmed. I recommend you to try it on the typical farm mission node for the crowns.