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Could we get an option to display your current SubHP on your prompt? It would be useful for players who often spar, especially to keep track of your subHP recovery outside of combat. It's only listed in the 'combat' command at present.

I'd propose %H for the tag.

Going to feel like a noob here but ... what is subHP?

Hi noob!

SubHP is what's damaged instead of your HP when struck with the 'safe' command. It can be recovered with eating/drinking/resting/sleeping like MV and HP.
If you try to spar again right after a spar, even if your HP is perfect and you drink enough to recover your MV you'll be knocked out in one hit, which people using trainer NPCs learn pretty quick.