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I am playing with the Sanity ability score option (DMG, p. 265-266). One of the suggestions on Sanity saving throws states:

Sanity Saving Throws. You might call for a Sanity saving throw when a character runs the risk of succumbing to madness, such as in the following situations:

  • [...]
  • Resisting an effect conferred by an attack or spell that deals psychic damage.
  • [...]

A failed Sanity save might result in short-term, long-term, or indefinite madness, as described in chapter 8, "Running the Game."

Say a player is hit with Synaptic Static (XGtE, p. 167), and is thus forced to make a Sanity saving throw.

  • Do they make the initial saving throw with Sanity, or just when trying to end muddled thoughts?
  • Do I replace muddled thoughts with madness?
  • If the person tries and fails to resist muddled thoughts each turn for the full minute, can they end up with 10 forms of madness?
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  • \$\begingroup\$ Please try to ask one question at a time (ie. per post). I am sure the last question is a separate one, the others might be better off divided too. \$\endgroup\$ – Szega Sep 25 '19 at 8:38
  • \$\begingroup\$ The last one will be removed then. \$\endgroup\$ – kent Sep 25 '19 at 8:42
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    \$\begingroup\$ I think with that last one removed, this is fine for one question. I agree that the "2 instances of the same madness" question is probably best asked separately, though... \$\endgroup\$ – NathanS Sep 25 '19 at 8:57
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RAW: left to DM discretion

The book fails to give the DM guidance on these matters, with phrasing like:

You might call for a Sanity saving throw [..] A failed Sanity save might result ..

So it is basically left to DM fiat. However, I do believe there is a sensible way to handle this.

Advice

Which saving throws?

There are two ways to interpret the sentence in the list, and I advise you look at it like this:

(Resisting an effect) (conferred by an attack or spell) (that deals psychic damage).

Ie. "that" refers back to "effect". Meaning you only ask for a Sanity save when the effect deals psychic damage. The effect can be an attack or spell. This would mean that only the initial save will be made with Sanity and Wisdom will be used to shake off the effect.

This will also mean that should you wish to inflict madness as part of failing a Sanity save, targets will at most get 1 of it. I think that potentially causing 10 different madnesses (though realistically 2-3 usually) might be too powerful for this spell. Also, if used on NPC-s, incredibly hard to track.

Replacing the effect

If you do this, you should do it consistently. Spells of varied power levels would result in insanity, and the three "tiers" of insanity provided in the DMG do not have that much granularity, which might result in much weaker on stronger effects than intended for those spells. Also, the affected spells would lose their individuality. I would generally recommend leaving spell effects as they are.

If you still wish to replace these effects (eg. for flavor/setting reasons), I would advise that you limit the duration of the madness to the duration of the spell (or its effect, if that makes more sense). Also, the madness table you roll on should depend on the spell level (eg. cantrip-lv2 > short-term, lv3-6 > long-term, lv7+ > indefinite).

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  • \$\begingroup\$ If I used your advice, how often should something like vicious mockery results in madness? \$\endgroup\$ – kent Sep 25 '19 at 19:59
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    \$\begingroup\$ Anytime the save is failed. But its duration would be limited to the duration of the original effect, "until the end of its next turn". I will clarify. \$\endgroup\$ – Szega Sep 26 '19 at 5:54

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