Defensive Sorcerer feature ideas?
With my DM we are building a homebrew Sorcerer subclass adapted specially to his setting, and we came to the agreement we wanted the 6th level feature to be a 'defensive fortress' type thing.
Essentially, you create a small area you cannot move and are well defended inside. You get +ac and + to all saves, but we still want a little more benefit to being in that area, so you could justify staying inside it and defending your position
Any ideas on what features would make this work, specializing on defense if possible?