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The wording on this spell is a little confusing to me.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for every two slot levels above 2nd.

Does this mean the damage increases when cast as a 3rd level spell, then again at 5th, 7th, etc? Or does it start at 4th, then 6th, and so on?

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When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for every two slot levels above 2nd.

Spritual weapon is a 2nd level spell. The first part of this description is simply telling you the rules for casting it from a slot higher than it's level, i.e., third level or higher. Many spells have greater effects when they are cast with a higher level spell slot.

The second part tells you specifically what effect casting with a higher slot has and how the spell improves based on which spell slot you use. In other words, casting it from a 3rd level slot doesn't grant any benefit, because that is not two slot levels above second.

The spiritual weapon's damage works out as follows:

  • 2nd level slot: 1d8 + your spellcasting ability modifier.
  • 3rd level slot: 1d8 + your spellcasting ability modifier.
  • 4th level slot: 2d8 + your spellcasting ability modifier.
  • 5th level slot: 2d8 + your spellcasting ability modifier.
  • 6th level slot: 3d8 + your spellcasting ability modifier.
  • 7th level slot: 3d8 + your spellcasting ability modifier.
  • 8th level slot: 4d8 + your spellcasting ability modifier.
  • 9th level slot: 4d8 + your spellcasting ability modifier.
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    \$\begingroup\$ I read it the same way, and have always played it this way, but I personally find the wording less clear overall than if they had said "4th level or higher" instead of "3rd". \$\endgroup\$ Apr 10, 2016 at 4:27
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    \$\begingroup\$ You would cast it with a 3rd level slot if that was the only available slot with which to cast it. I.e. you are out of 2nd level slots, and either don't have or are out of 4th level slots or above. If the wording specified "4th level or higher", it could cause confusion about whether you could even use a 3rd level slot. \$\endgroup\$ Sep 28, 2017 at 3:35
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    \$\begingroup\$ I don't believe that's a good reason to have it say "3rd level or higher", as it is already clear in Rules of Magic that spells can be cast with a higher level slot. A specific example if Hex, that doesn't have an increased effect unless cast at 3rd level or higher, despite being a 1st level spell. To avoid confusion like this, they really should have said "4th level or higher" \$\endgroup\$
    – RallozarX
    Nov 22, 2019 at 18:11
  • \$\begingroup\$ @RallozarX I don't think there is anything confusing about the way it is written. It is logically correct. "4th level or higher" is a subset of "3rd level or higher." You don't get any benefit from casting it at a 3rd level slot, and the rules are clear about that. We're not here to justify the wording of the rules, what it should have said and what it does say are two different things. \$\endgroup\$ Nov 26, 2019 at 15:11
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It's not clear; three similar spells have three different wordings

Searching the PHB for "each slot level" finds 84 spells, from Aid to Witch Bolt, that increase their effects when upcast, with the increase occurring at each slot level.

On the other hand, searching on "every two slot levels" reveals all of two spells that use this phrase: spiritual weapon and flame blade.

In the case of flame blade, it is a second level spell that does 3d6 but when cast at

4th level or higher, the damage increases by 1d6 for every two slot levels above 2nd.

Here, it is clear that the two levels is a threshold effect (and not a statement of a rate of increase scaled to whole units); casting it at 3rd level will produce no change in damage.

So spiritual weapon is unique in that its effects increase every two levels, but its spell description explicitly says that the increased effects manifest at one spell level above its regular cast. Since it is unique, we don't have anything to compare it to in order to deduce its intent.

It could be that the damage simply increases by d8 every two levels, so that when cast at 3rd there is no difference to damage. If that is the intent, however, then it is simply poorly edited. If it is supposed to do no more damage at 3rd, then it should be worded like flame blade, without the possibility of confusion. Telling us it can be upcast to 3rd level is pointless, since we already know that from the general spell rules:

When a spellcaster casts a spell using a slot that is of a higher level than the spell, the spell assumes the higher level for that casting. For instance, if Umara casts magic missile using one of her 2nd-level slots, that magic missile is 2nd level.
Effectively, the spell expands to fill the slot it is put into.
Some spells, such as magic missile and cure wounds, have more powerful effects when cast at a higher level, as detailed in a spell's description.

If Spiritual weapon cast at 3rd does no more damage than when cast at 2nd, then it does not, in fact, detail in its spell description what its more powerful effects are when cast at that higher level. The spell description is simply in error; mistakes in editing do happen.

By the time of XGtE, a different means of presenting a similar progression is used for Shadow Blade (2nd level)

When you cast this spell using a 3rd- or 4th-level spell slot, the damage increases to 3d8. When you cast it using a 5th- or 6th-level spell slot, the damage increases to 4d8. When you cast it using a spell slot of 7th level or higher, the damage increases to 5d8.

To the extent that XGtE comes after the PHB, this could be taken as a statement for how spiritual weapon is supposed to work, RAI, validating the view that spiritual weapon does not do extra damage at a third level cast but also supporting the idea that the text in the PHB is poorly edited and ambiguous. Note, however, that in order to be explicit about the damage done by shadow blade, XGtE had to devote five lines of text to the "At Higher Levels" description compared to the three lines for spiritual weapon in the PHB.

While I doubt that the text in the spiritual weapon spell description is correct and intentional, it can be run as written, in which case it does more damage at every spell level increase. Returning to the 84 spells that do increase in effect at "each slot level", some of the increases are not "partible"; they are measured in creatures, amount of ammunition, challenge ratings1, hp, temporary hp, spell levels, rays, or missiles. None of these can exist within the game as fractions.

However, other spell effects that increase with spell level are measured in things that are partible; gallons, feet, dice of healing, and dice of damage. Dice of damage, in fact, are by far the most common effect that increases with spell level.

If Spiritual weapon increases by 1d8 for every two levels, this is the same as saying it increases by half a d8 every level2.

Thus, when cast at 3rd level, you could have spiritual weapon do 1.5d8 plus your spell casting mod.

When cast at 4th level, the base damage is 2d8, and when cast at 5th it could be 2.5d8.

This small increase in damage is hardly unbalancing, gives the players more meaningful choices over their spell slot use, and allows you to run the spell as written if you want.

1Yes, there are challenge ratings expressed as fractions, but these are below the minimum challenge rating effects of the spells that produce increases in challenge rating with higher level casts: cf. Summon Elemental, Summon Fey.

2This is rolled as a d8, halved, and rounded down. So for example a "1" rolled on half a d8 is 0 points of damage, and a "3, 5, 4" rolled on 2.5d8 is 10 points of damage.

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  • \$\begingroup\$ 'if "half a d8" is a thing' - it is not, the entire premise of this answer is nonsense. "the amount of damage you take from a rapier when you have resistance to piercing damage" that's just literally not true. Damage is calculated normally, and then halved when resistances are applied. There are no half dice involved anywhere. Or any dice for that matter, the rules for resistances don't even mention dice. \$\endgroup\$
    – Cubic
    Oct 2, 2022 at 11:42
  • \$\begingroup\$ @Cubic The amount of damage the rapier does is d8. The amount you take is half of that. How is the amount you take not half a d8? \$\endgroup\$
    – Kirt
    Oct 2, 2022 at 14:51
  • \$\begingroup\$ "How is the amount you take not half a d8". Because the "The amount of damage the rapier does is d8" is just incorrect. Damage in D&D is a number, not any amount of dice, and certainly not fractional amounts of dice (which just isn't a thing in general). "Roll a d8" isn't even how you calculate the damage of attacking a rapier, you seem to have forgotten that you apply modifiers as well. Now colloquially you can say "this does d8 damage" when talking about EVs, and stat blocks will list the dice involved for calculating damage, but the damage isn't determined in terms of dice. \$\endgroup\$
    – Cubic
    Oct 2, 2022 at 15:49
  • \$\begingroup\$ @Cubic My perspective is that it is valid to talk about dice of damage for a range or future potential, and points of damage when talking about actual events that have occurred. Thus, Brutal Critical can use language like "Beginning at 9th level, you can roll one additional weapon damage die when determining the extra damage for a critical hit with a melee attack. This increases to two additional dice at 13th level and three additional dice at 17th level." \$\endgroup\$
    – Kirt
    Oct 2, 2022 at 20:52
  • \$\begingroup\$ @Cubic And, ignoring modifiers (not everyone has a str bonus or penalty) I don't see a difference between saying "the damage done is what is rolled on a d8 but the damage you take is half of that" and saying "your damage would be half a d8". It's certainly not official usage, but I find it useful and I think it is an option if you want to use the spell as is (likely unintentionally) written. YMMV. \$\endgroup\$
    – Kirt
    Oct 2, 2022 at 20:56
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I disagree with the interpretation that says the damage only goes up at 4th level or higher. There is an effect at 3rd level because it says so, "3rd level or higher" comma. Yes, it could possibly be worded with a bit more clarity, but we cannot ignore the fact that something happens when using this spell at 3rd level. What happens after the comma explains the what.

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  • \$\begingroup\$ Hi Brad, welcome to RPG.SE! Take the tour; it's a useful introduction to the site. I've edited your answer because unlike a traditional forum, answers shift position depending on voting, so it doesn't really work to "reply" to the answer above you. If you think I've changed your meaning, though, feel free to edit further or revert. \$\endgroup\$ Jun 18, 2017 at 1:26
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    \$\begingroup\$ You also can't ignore everything after the comma, which includes the phrase "for every two slot levels above 2nd." Is a 3rd level spell slot two slot levels above 2nd level? No, it isn't. \$\endgroup\$ Sep 28, 2017 at 16:35

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