[2S > jc > j.B > j.S]xN
This sequence works easily when the opponent is in the air. It's a great fallback for stray hits.
If maximizing for damage, you can skip j.B, but the timing is generally not easy. The loop itself is harder to execute when starting from a raw 2S as opposed to mid combo, so you should practice it in a BnB instead.
If you're not feeling confident about hitting 2S immediately after landing, you can use 2BGuardLowStartup10Recovery26Advantage-11~-20 or 5BGuardAllStartup9Recovery19Advantage-3 and then cancel into 2S instead, though this will usually result in less damaging combos. Experiment and find what works best for you.
Doubles as an effective way to go into enders.