A Dragon's Lair
Archer smiled as he began speaking to the Brownie's leader. "I can make you a new home, or you can stay here. It's up to you, Twigg."
Twigg stepped forward and bowed while making a request, "We would prefer to stay below the treehouse, but could you give us more space, please, Master Archer?"
He nodded in agreement. Closing his eyes, he visualized the Brownie's home expanding, tripling in size to accommodate their needs.
Additionally, he created an underground chamber beneath their home, only accessible through a concealed staircase in one corner.
Opening his eyes, Archer walked over to the entrance and cast Mana Manipulation to hide it using earth magic.
He teleported himself into the underground chamber, noting the presence of the staircase, and concealed it in the same manner as the entrance.