These types of mechanics came up last night in a game I ran, with the MCDM Shadow & Specter. The Shadow lowers Dex by 2 with every hit, and the Specter wipes a hit die. Obviously when a stat reaches 0 that tends to result in death, like the Shadow's effect does, and the Specter kills/raises the PC as another of its kind when its hit asks for a hit die to be erased by none are present.
I agree with the folks saying these effects stand out like a sore thumb among the general sea of creature abilities in 5e (2024 or otherwise). However, I will counter with these effects being sick as hell. My players loved the danger and tension they brought (they're level 3 so they were the perfect level for these I think). Now this comes down to the types of players you have, but it was a memorable and fun encounter that put a tangible clock in the fight that was more pressing than just dropping to 0 hp.
That's unfortunate. I was always a popular DM when running public games because people knew it wouldn't be a cakewalk. Some of my most memorable games had almost everyone in the party unconscious at one point or another. It's not like death is permanent in those games, unless it's changed over the past couple of years since I stopped being involved because of COVID.
I think that it's a more fundamental problem due to players entering the hobby in a way that encourages them to view any changes from the GM as some kind of BadWrongFun EvilKillerGM thing. going beyond the small example encouraging the GM that @James Gasik embedded a couple posts back, the ALDMG has always tried pretty hard to poison that well should a GM try drawing from it. Unfortunately it does so in a way that empowers problem players.
Not sure what adventures it covers but it was on my hdd with the other & is dated with this at the top
D&D® ADVENTURERS LEAGUE
DM’S GUIDE
Effective Date: March 4, 2024. Version 14.0.
Myexperience running AL was similar if not identical to the post 88 extreme pushback. I've seen players literally go from asking "what adventure are you running" to pulling out their phone & searching for the magic items in it while standing in front of me conversing aboutwhat part of an adventure I was running★. It's one thing to do that because your at a store & looking to buy a particular product on your list or whatever but totally different to think that's acceptable after seeking out a potential GM who never approached you.
A lot of my nonAL games that started as AL & moved off for whatever reason are somewhat better, but it's not infrequent that one player decides I'm being a monstrous killer GM if I say no you can't relax enough for a rest" or provide the appearance of an actual challenge causing them to stop the session demanding metagame level explanations only for the other players to immediately chime in with "YeAaA hE's GoT a PoInT... YoU diDn'T cOveR tHat In SeSsIoN zErO" or give it a supportive pass by letting someone else take point+supportive second while pretending to nope out of the session hijack to focus on stacking dice or fiddling with their cellphone. It's almost reprehensible for wotc to bind GM's so heavily in the edition they claim so many things were done to empower "rulings not rules"
★I.e. while players are still rolling in & I'm early & setting up... me: "we are going through LMOP">player checking phone:"oh, Cragmaw?" (gauntlets of strength/MM Wand?)>me:"no">player checking phone: "old owl well?" (ring of protection?)>me:"no, you should find another table, there are like five">Player still checking phone & not finding another table: "Wave echo cave?(boots of striding, a magic weapon & magic armor?)> me:"no I've got a pretty stable group we are doing [low treasure bit] , you should check another table, maybe that one">player who still has phone out: "Yea Maybe I'll try you again when your running something better"
I have had players discuss going on certain adventures to get specific loot, and DM's who were willing to run those adventures, but I never had someone check their phone before sitting down at a game!
That having been said, what I did have was any time a rules question came up, I'd say what my ruling was, and instantly everyone at the table was looking for a sage advice/developer tweet, hoping it would be more favorable to them.
Like any time I enforced darkvision penalties, I would have players whining because apparently "no one ever uses those". It was so bad that I printed out sections of the PHB with page references and slapped them on my DM screen (I had a custom one with sleeves for pages so I could insert whatever I wanted on either side) just for things like "yes, disadvantage does reduce your passive score by 5" and "no, you really can't cast a quickened fireball and then use your wand of magic missile in the same turn", as well as "using a magic item ability is it's own action, not Use an Object"*.
*I think there's some grey area here for things like the necklace of missiles or bead of force, but that never came up.
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Back on topic, monsters that drain healing surges/hit dice- these existed in 4e, and I kind of forgot about them. They were, simply put, devastating in that game, because without healing surges, you couldn't heal, which could suddenly make it impossible for a front liner to continue. In 5e, it seems far less threatening. It was only in the last month that I marveled that a party had run out of hit dice in my ToV game!
Stat drain, which shadows are one of the creatures to have (that I'm aware of) was a big deal in 3e, but the need to recalculate your modifiers and the fact that such a creature was either a nuisance or led you down a death spiral, based on which stat it was draining away, was bothersome.
(Drain a Fighter's Cha, he's not going to care until it's gone. Drain his Str, and suddenly he might be unable to attack anything effectively. Drain his Int, and suddenly half his feats go offline (Combat Expertise). Drain anyone's Con, and watch their hit point totals implode, killing them long before the lost Con probably does).
And of course, in the hands of players, you suddenly had things like Empowered Maximized Shivering Touch/Touch of Idiocy one-shotting monsters. I was glad to see that sort of thing (mostly) go away!