What bottom bracket removal tool do I need?
It's just the regular old 20-spline cartridge type tool, i.e. Park BBT-22. I have seen a few like this, although I don't really know what the deal is with them.
While there are now an enormous number of outboard type BB tool spline patterns, internal cartridge BBs pretty much exclusively use either the Shimano-originated 20-spline tools or the smaller Campy spline pattern.