You just get your Imps to claim them like regular Portals and the different rooms in your dungeon attracts the Heroes version of the creature it normally spawns
Example:
Normal Portal + 5x5 Hatchery + Workshop = Bile Demon
Mercenary Portal + 5x5 Hatchery + Workshop = Giant
Normal Portal + (Minimum) 3x3 Library = Warlock
Mercenary Portal + (Minimum) 3x3 Library = Wizard
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Use the portals or the elevator.
you step into the purple portal and wait a second. then it will load you to the nether.
Use the portals (Hint: The bottom right portion of the gym has the exit portal).
use the key to open the door.
Dungeon Defenders