If you're going to start technical diving, you'll need to start thinking about hydration and it's inevitable consequence. Proper hydration helps prevent decompression sickness. Enter the Halcyon P-Valve, an essential device that allows you to drink as much water as you want before long dives and not have to worry. Also when diving with Helium you won't want to be putting that chilly gas in your suit, so you'll also need some sort of Drysuit Argon Cylinder and Regulator that you can fill with a more thermal gas like Air, Nitrox or even Argon.
This section covers the extras you may just want to use alongside your Telescoping Drysuit.