> At the start of combat, roll a d4. In that many rounds, something (usually something bad) will happen. I once had a GM whose house rules included every battle receiving enemy reinforcements each d4 rounds. One combat took three weeks to resolve. At the end there were four factions in the ruckus and it was taking about 60 minutes per round for him to run it. After the first evening we weren't even trying to fight anyone, we were just withdrawing. So a lot of these suggestions need "...but not to the point of bogging down the game" added.

So it is possible to have reinforcements every single round? Yeah, that is a terrible rule. I have used a d4+2 to determine how many rounds of combat will draw attention, but only for a single reinforcement. The floor of three rounds is because that is *18 seconds* in DnD. Enough time for other enemies to wonder if someone is just having a spat and not worth checking out or for the enemies to realize they are going to die and think of calling reinforcements being worth it over being ridiculed or punished by higher ups.

>When you make a ruling, explain your justification out loud. If you're targeting a random person, tell the players the stakes before you roll. "OK, evens the wyrm goes after Faust but on odds it'll go for Drena even though she's on the ground." Saying what you are doing at all times is the absolute best thing you can do in my opinion, because it makes it clear to the players what your intents are and promotes honesty. I would spice it up with an in game description, such as the dragon flicking his eyes between the two and saying "The wyrm flicks his eyes between the two characters. Evens for Faust and odds for Drena (rolls). The wyrm dives to the ground at Drena." In my combats I will have monsters convey reasons for what they do, such as a melee character saying "A challenge!" when focusing on the fighter over the bard or "Out of the way!" if they take a swing at the Bard before focusing on the fighter. Goblins screaming in fear before disengaging if they survive a hit, or even a humanoid yelling "Fall back!" to make it clear why they are making a coordinated retreat and allow the players to end combat some other way than just killing everything they come across.

Good call. Makes sense in fantasy combat-context.

[Runehammer has a nice video on Timers](https://www.youtube.com/watch?v=HcfieLbrQAc) with some more examples.

> I once had a GM whose house rules included every battle receiving enemy reinforcements each d4 rounds. >he end there were four factions in the ruckus and it was taking about 60 minutes per round for him to run it. Actually if combat are long enough that re-inforcement have the time to come you're doing something wrong. NPC aren't stormtroopers who always miss, and PC aren't doing practice shooting. A combat shall be quick and deadly, if you're lucky one hit shall cause an injury, but usually an opponent doing a successful attack roll will at least incapacitate a PC.

> Actually if combat are long enough that re-inforcement have the time to come you’re doing something wrong. I thought then and I think now that a rule which can potentially increase the number of opponents every round shouldn't apply in every combat. And that running a TTRPG as a solo wargame with (very!) occasional participation by other players is a bad way to have fun with your friends.