OB1
Jedi Master
I've been running a very similar version of your 1 rule for about a year now and it's been great. I started with using 'Slow' as well, but switched to Dazed (one action, bonus action or move, no reactions, can't concentrate on spells). I also have the effect last until a DC19 Con Save is made (make at the end of your turn while above 0 HP), which makes things a lot nicer for front line melee types. Lesser restoration or a short rest will also end the effect.
Overall it's led to much more exciting fights (as players tactics have to change dramatically once someone is dropped to 0HP) and healing spells tend to get thrown around earlier in combats to prevent dropping to 0HP in the first place.
Overall it's led to much more exciting fights (as players tactics have to change dramatically once someone is dropped to 0HP) and healing spells tend to get thrown around earlier in combats to prevent dropping to 0HP in the first place.