[@SilverDawn]
The stealth presents itself when in an investigative setting, such as a whodunnit arc. He may also begin an encounter "cloaked", and later "reveal" himself to the heroes/investigators/peanut gallery. Once revealed or noticed, it becomes useless until he's out of mind of those who noticed him.

The speed is a bit of an interesting quandary. When off-camera, he can cover large distances nigh instantly to come to his master's call. On-camera, he's a normal speedster, focusing on outspeeding foes rather than outmuscling them. Not on par with The Flash or anything like *teleprots behined u*, but still respectably fast.

His materialization is limited to anything you'd find in a generic high-class mansion,. Antique weapons, bottles of wine, cutlery (hint hint), and other items. It's also limited to things he can carry himself, so no sudden suits of armor or nuclear weapons (the latter being outside the mansion rule as well). I'd consider pets well within bounds here as well.