This seems to be a big deal for some people... someone here on the boards gets an old thread in their mentions and then read it and respond, not noticing the thread is "old". And invariably there are other who then show up to say "Necro'd thread!"... as if that is actually a problem.
Why exactly? Why is responding to an old thread such a big deal? Quite frankly I think a lot of concepts and ideas would be better off if the person who created a new thread had actually gone back and reread the old ones that had already gone over the same exact ground. Because they'd save themselves a lot of time and energy and seen exactly what everyone had already come up with for an answer. I mean, it seems like ever several months there's a brand-new thread asking why there isn't a Warlord or an Arcane Half-Caster in the game, or how do people run the Stealth rules... despite the fact that we've had three, five, nine, a dozen previous threads about them over the years.
Personally, I think if people are going to keep pointing out "Thread necromancy!", it's only right and fair that when a new thread is made regarding a topic that has clearly been created many times before, that someone immediately post 'Thread conjuration!"
** In the spirit in which this thread was created, I hope and expect someone to please do a search on this exact same topic, then post the link to that thread that also decries the continued castigation of thread necromancy, and follow it up by a "Thread conjuration!" response. Thank you. You do the Arneson's work.**
And when you see a new thread started by a recognizable poster and you don't even have to click through because you already know what it says, that's called Thread Divination.If there's a flamewar, we can post "Thread evocation!"
Seriously, I don't see a problem with it. Maybe you're searching and have information for a post that never got answered--even if it's not going to help the OP, it can help the next person who goes searching. Look at all the witch threads, for instance. I was able to recommend them to someone who wanted to make a 5e witch equivalent, and even the ones that were inactive were helpful.
Thread Transmutation is when a thread goes off-topic.And when you see a new thread started by a recognizable poster and you don't even have to click through because you already know what it says, that's called Thread Divination.
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Thread enchantment is when the reader must make the Wis save or be compelled to post a comment.Thread Transmutation is when a thread goes off-topic.
Thread Illusion is when the poster puts the 5e tag on a TTRPG general post or vice-versa.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.