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Initially I thought that the whole point of the Nondetection spell is to protect you from all variety of spells like See Invisibility. It sounds quite logical based on the spell's name.

However, then I've realized that then Greater Invisibility + Nondetection would be extremely overpowered: you're just buffing your rogue/ranger/fighter with these spells and he just kills everyone with insane all-advantage attacks. And even those mages can't see you with a standard See Invisibility buff.

The spell descriptions says

The target can't be targeted by any divination magic

And I thought that See Invisibility doesn't target other creatures and that's why the spell shouldn't protect you from See Invisibility.

I'd appreciate a clarification on this interaction between these spells.

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    \$\begingroup\$ @From actually I didn't know about True Seeing since our party is way below 11th level, so when searching I thought that it some kind of other spell and the question is irrelevant to mine :). Now after reading that other question I see that True Seeing basically includes See Invisibility. So that other True Seeing answer question is also a good answer for See Invisibility as well. \$\endgroup\$
    – Lisa
    Jan 13, 2023 at 22:17

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Yes, but Remember that Invisible is Not Hidden

The other answers are correct in their assertion that Nondetection counters divination magic as written and that See Invisibility falls under that criteria.

I would also like to address another concern, however. You state in your question:

However, then I've realized that then Greater Invisibility + Nondetection would be extremely overpowered: you're just buffing your rogue/ranger/fighter with these spells and he just kills everyone with insane all-advantage attacks. And even those mages can't see you with a standard See Invisibility buff.

You're correct that this would be powerful, but I'm not sure if it would rise to the level of being overpowered per se. Consider that for this to work, 2 characters have to work together; and 1 of them needs to be a caster capable of at least 4th level spells (so at least 7th level), then has to supplement a 3rd level spell, and also needs to expend that slot and maintain concentration.

Doing so will result in an invisible Rogue moving about the field and capable of dealing a bunch of damage for 1 minute.

However, unless the Rogue spends a Bonus Action each turn with their Cunning Action then each attack will give away their location, see Unseen Attackers and Targets which states:

If you are hidden - both unseen and unheard - when you make an attack, you give away your location when the attack hits or misses.

Thus, the Rogue is going to still need to keep hiding if they want to avoid attacks coming their way (granted those attacks will likely be at Disadvantage).

But consider the alternative, which is the Rogue's hard to find, but there's a squishy caster I can see. If I hit them hard enough, that might break concentration and then I can find the Rogue.

Overall, I don't find this to be particularly overpowered.

In my experience with playing a ranged Rogue, it's often very easy for a Rogue to find sources of cover sufficient for them to almost always be able to make a successful Hide attempt and rarely are enemies' Perception scores high enough to make the relevant Dexterity (Stealth) check overly difficult.

Ultimately, this just makes what was an easy job even easier.

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Nondetection hides you from all divination magic.

Flavorful language in spell descriptions are rules too. Indeed, the entire spell description is the spell's effect. From the rules for reading spell entries:

The rest of a spell entry describes the spell's effect.

So the description of nondetection is telling us the spell's effect when it says:

you hide a target that you touch from divination magic.

See invisibility is a divination spell, and nondetection says it hides you from divination spells. Ergo, while under the effects of nondetection, you are hidden from divination magic, such as see invisibility.

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  • \$\begingroup\$ Thanks! But isn't it a super overpowered balance-breaking combo then? (greater invisibility + nondetection). Could you please comment on this as well? I even was close to consider house ruling this spell so that it won't be such a killer balance-breaking combo. Or am I not getting some weak spots of this combo? \$\endgroup\$
    – Lisa
    Jan 13, 2023 at 21:56
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    \$\begingroup\$ @Lisa I'll be available for further comment later this evening. \$\endgroup\$ Jan 13, 2023 at 21:59
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Many monsters can see invisible creatures

Nondetection + Invisibility only protects from divination magic against seeing the invisible creature. Blindsight is no divination magic. Neither is Tremorsense, nor Truesight. There are many monsters with these senses, more than the number that uses divination magic. For other characters, the blind fighting style works, too.

Yes, the combo is nice, as Greater Invisibility generally is against spellcasters, but given that many monsters can ignore it, and at the cost of two spell slots, one of 4th level, it is not overpowered.

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