Rhenny
Adventurer
Tactics! Play that 4HP Kobold like it's your own PC.
When the bodies are looted, it's probably got a pouch with 10GP in it. That's a lot to the lil guy, have him barter for his life. I know most murderhobo parties will kill it anyway, but it should give pause.
Use Actions other than Attack. Use Help and Disengage cleverly. You could even rule that a monster reduced to 0HP isn't unconscious but is bleeding out (hey, give it death saves, so they're not just auto dead). Maybe while bleeding out, if at the feet of the PC, you allow it to Help (blood soaked hands clawing desperately at the fighters legs, causing him to be distracted just enough that Snotpickle - his dearest friend - can make that stab count).
Up til now I've had a goose/gander HP apartheid - the PCs get death saves but the monsters, at 0, are dead. I've been toying with changing this, especially as they're 5th level now with all the extra attack toys.
Cool...thanks for adding. The Help action works especially well when the PCs face a number of weaker foes and some more powerful ones. The weaker ones could try to help/distract to give the stronger ones advantage. That will definitely make a difference. The goblin who can only do 1d6+2 damage would gladly sacrifice an attack to give the bugbear a better chance to do 2d8+2.
I could totally see giving the leader or special monsters that chance to use death saves too...or sneaky DM just ruling that the foe that was bleeding out suddenly gets back up (just something the DM can add in once in a while). For the special monsters or leader types, I sometimes give them the fighter's "second wind" and "action surge." That makes them much more resilient.