TJRat wrote: Our experience involved a DM who repeatedly targeted one player. He tried to justify by saying that the monster recognized the threat the player posed. Unfortunately for this 'theory,' the player hadn't slid against the monster at all.
A similar incident (or perhaps it is the one you were referring to) occurred during True Grind when I was DM'ing on Friday. I ended up killing a Barbarian, whose player was not very happy at all. This was either the Friday 12 PM Flyingdingus run or the Friday 7 PM Quip run.
At least in Grind, there are several ways that the monsters can determine if a player is a threat.
1. Some are obvious like a giant hulking Barbarian with massive, rippling muscles but wearing nothing but a loincloth. Or a squishy, frail looking Wizard wielding powerful magic.
2. At least in Grind, monsters can learn from each other's mistakes. Monsters can communicate with each other (Undercommon?) just like players can. And oftentimes, monsters may be observing prior Grind combats before jumping in the fray.
3. Sometimes the boss monster is behind everything. I liken this to a lot of video games and movies where the waves of monsters are meant to weaken the heroes and test their capabilities - all orchestrated by the boss. In this year's WYC Grind, the Marileth was designed to be acting as a general - observing all of the prior rooms and coordinating and giving tactical commands to the lesser monsters. I even had provisions allowing it to cast some helpful spells during the earlier rounds (though I never ended up doing this). This year's GenCon had the Son of Smoak as well as the genius-intelligence, telepathic Aboleth observing and communicating.
After a particularly brutal series of 'hits' on the player, the DM asked 'how many hit points you got left?' That's when I intervened and asked the DM how he (as the monster) would know this? Sadly, two more players will not return since they feel they wasted their money.
I recall an incident like happening, so I suspect the situation you are describing was with me.
Well, a monster should be able to determine the relative state of a player. Just like how players normally are able to determine the relative state of a monster.
If a player asks about the monster, I won't tell them the exact HP it has, but I am happy to describe whether the monster appears relatively untouched, bloodied, or on its last legs.
Similarly, a monster should be able to determine how hurt or unharmed a player is.
Secondly, player HP is supposed to be publicly displayed information shown with paper clips on the Character Card. But between the dark setting making it hard to see, paper clips getting lost, and players using their own HP counting devices instead (like those on the thumb), DM's are sometimes not able to access this public information.
Thirdly, since player HP is controlled by the player, there is a high potential for cheating or accidental mistakes. There have been times when players have not informed the DM that they are dead (and their dead corpse gets attacked). There are plenty of times when they make mathematical mistakes and end up with the wrong HP. There are plenty of times when they misapply damage reduction items.
I recognize that DMs should have full control over the reactions of the monster, within the bounds of the description. But shouldn't they consider rolling a die to determine who gets attacked if no character makes an 'impression' upon them?
No, random flailing at a random character is very rarely a good or logical course of action, even for low intelligence or instinctual monsters, let along clever ones or those following orders.
Sometimes, for the sack of simplicity or for the sake of fairness I might introduce some randomness (say, if I have a deadly attack).
Having the monster's attack be completely random is bad because it can be easily metagamed and removes a lot of the challenge. With this type of system, players legitimately argue that "AC is useless since you only have a 10% chance of being targeted anyway" and this leads to less diversity in builds. Not to mention certain effects like the Cloak of Shadowskin make such random tactics a complete joke.