Henchmen can only be purchased when it is your turn during a duel, and only if there's a free duel sigil on your team.
The "Bric-a-Brac Elixir" is available for 995 Crowns and lets you add space for 50 more decorating items in either the interior or exterior of your house. You can purchase the elixir as many times as you like, up to a total of 300 decorating spaces per zone.
You have to use the elixir in the area of your house that you want to increase. If you want to increase the number of decorating spaces on the interior of your house, you must be in the interior of your house when you buy the elixir, and you will need to purchase a separate elixir for the exterior of your house.
