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Reviewing an answer to a recent question I posted, I had a thought about Armor of Agathys. In the event of a Sorcerer 18 / Warlock 2 build, would the character be able to cast Armor of Agathys with a 9th level spell slot, thus getting 45 Temporary Hit Points and dealing 45 damage when hit?

Is the spell in any way limited to being cast using Warlock spell slots or to a maximum of a 5th level spell slot?

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  • \$\begingroup\$ In the ending of your question, I believe you mean "to a maximum of a 9th level spell slot"? \$\endgroup\$ – Netzach Sephira Apr 13 '18 at 15:38
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    \$\begingroup\$ As a full Warlock, the spell can never be cast above 5th level because they don't technically get higher spell slots. I was asking if Armor of Agathys is limited to a maximum of 5th level spell slot because it is a Warlock spell. I just wanted to make sure that I was understanding correctly that a Sorcerer / Warlock can cast a Warlock spell better than a Warlock. \$\endgroup\$ – Joshu's Mu Apr 13 '18 at 15:41
  • \$\begingroup\$ You are correct, I misread. My bad. \$\endgroup\$ – Netzach Sephira Apr 13 '18 at 15:44
  • \$\begingroup\$ @joshusmu Would you mind if we rephrased your title/question to be about casting any spell (instead of specifying Armor of Agathys) at a higher level, and just use AoA as an example? It might help someone looking at other Warlock/Paladin/Ranger spells in the future. \$\endgroup\$ – Ifusaso Apr 13 '18 at 16:30
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    \$\begingroup\$ @Ifusaso Sure let me think about how to phrase this in the most generic way possible. To me, the specific issue was Warlock, because of their funky multiclassing conditions due their unique spell slots. The new title reflects this. \$\endgroup\$ – Joshu's Mu Apr 13 '18 at 17:04
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Yes, you can cast a spell with any spell slot available to you

As a multiclassed spellcaster you can use any spell slot you have to cast any spell that you know/can prepare from any of your spellcasting classes. There is no restriction on which slot can be used for which spell.

This is even specifically allowed in the PHB section on multiclassed spellcasting:

If you have both the Spellcasting class feature and the Pact Magic class feature from the warlock class [...] you can use the spell slots you gain from the Spellcasting class feature to cast warlock spells you know.

As a Sorcerer 18 / Warlock 2 you have one 9th level slot which you can use to cast any spell you know/can prepare which includes armor of agathys (a 1st level Warlock spell).

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    \$\begingroup\$ It might be worth adding that certain invocations specify that the a spell is cast using a "warlock spell slot" or that to use the benefit of an invocation you must expend a "warlock spell slot". Some of those spells are spells that you also might know (fireball from Kiss of Mephistopheles) and others are spells that a Warlock would not now (conjure elemental from Minions of Chaos). \$\endgroup\$ – Pilchard123 Jan 11 at 14:45
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You can cast the spell with any spell slot available to you.

This is a multiclassing issue, so the following questions arise.

Can you prepare the spell/Do you know the spell?

Yes. As Armor of Agathys is a 1st level Warlock spell, and you have 2 levels in the Warlock class, it is clear that you have this spell.

Spells Known and Prepared. You determine what spells you know and can prepare for each class individually, as if you were a single-classed member of that class.

Do you have the spell slot?

Yes. In your example, at Sorcerer level 17 you would get your 9th level spell slot.

You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, half your levels (rounded down) in the paladin and ranger classes, and a third of your fighter or rogue levels (rounded down) if you have the Eldritch Knight or the Arcane Trickster feature. Use this total to determine your spell slots by consulting the Multiclass Spellcaster table.

Can spells gained from Pact Magic be cast in other spell slots?

Yes. It is explicitly stated that this is possible.

you can use the spell slots you gain from the Pact Magic feature to cast spells you know or have prepared from classes with the Spellcasting class feature, and you can use the spell slots you gain from the Spellcasting class feature to cast warlock spells you know.

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