Domain Fortress

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Fortresses are discovered by assigning Station Companions to Watchtowers in Domains. Fortresses are destroyed upon conquering, or expire after 3 hours. Conquering all stages grants 3 domain materials (6 if Boss is encountered) and a chance to capture a Monster. 
A Fortress can have up to 3 Stages. The higher the number of Stages, higher the chances of Domain Boss appearing. 
Only Combat Companions assigned to the Combat Center of a Domain may be used in Fortress combat in that Domain. Any Combat Companion reduced to 0 HP from a Fortress battle must rest for (x) hours before being used again in that Domain (determined by the Upgrade level of the Combat Center).
Fortresses may be singularly instantly cleared, or instantly cleared across the entire Domain with Fortress Sweep. Fortress Sweep grants the same rewards as conquering a Fortress, and requires no Companion Combat. Each Stage of a Fortress requires 1 Sweeping Ticket per Stage. All Stage 1 Fortresses can be swept for free (no Sweep Tickets) if the Domain Lord of that Domain (Beatra, Danan, or Lilith) is level 60. Stage 2 Fortresses can be swept at level 120, and Stage 3 can be swept at level 200. 
#Time left before Fortress disappears.
#Monsters that can show up in the fights, and that have a chance to be captured.
#For 30 gems, you can ensure that you capture a random monster when you conquer the fortress.
#Number of Stages.
#Materials that can be obtained upon conquering the fortress.
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#You can improve your chance to capture monsters through Industry (18% for Legendary, 16% for Immortal, and 10% for Mythic), and 2.5% for All Monster Grades with an Association. 
#Even if you don't defeat the enemies in one try, you can try again with different companions. The enemies will maintain damage (and death) from the previous battle attempt.