As an Oathbreaker Paladin/Warlock, my character gets darkness as an oath spell at level 5, meaning he can cast it using his holy symbol. In the event that he loses his holy symbol, does he have to have wasted a known spell slot to be able to cast it off of his arcane focus?

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    \$\begingroup\$ Could you explain what you mean a bit further? I'm assuming you're saying that because you know the Darkness spell as an Oathbreaker Paladin, you basically want to know if you can use a Warlock spell slot to cast it instead? \$\endgroup\$ – Whambulance May 28 '19 at 10:08
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  • \$\begingroup\$ Well a 5 paladin/5 warlock with oathbreaker has darkness as an oath spell and darkness available as a 2nd level warlock spell. At 5 warlock He'd have 6 spells known. Does he need to spend one of his 6 known spells on a second copy of darkness to be able to cast it with an arcane focus? \$\endgroup\$ – Matt200288 May 28 '19 at 10:22
  • \$\begingroup\$ @Matt200288 Ah right, I think you might also be confused with the difference between Spells & Spell slots? If a 5th Level Warlock had learned Darkness and wanted to cast it, they wouldn't expend one of their 6 known spells, they would expend one of their 2 available Spell slots. Otherwise, yes, you are correct - I won't put my answer in the comments though \$\endgroup\$ – Whambulance May 28 '19 at 10:35
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Yes, as known spells are handled individually when multiclassing

Credit goes to V2Blast and Protonflux for correcting my answer

Multiclassed Spellcasting:

Each spell you know and prepare is associated with one of your classes, and you use the spellcasting ability of that class when you cast the spell. Similarly, a spellcasting focus, such as a holy symbol, can be used only for the spells from the class associated with that focus.

Spell slots are shared between classes with the Spellcasting feature, and Pact Magic is also handled the same way. For Spellcasters with the Spellcasting Feature:

Spell Slots. You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, and half your levels (rounded down) in the paladin and ranger classes. Use this total to determine your spell slots by consulting the Multiclass Spellcaster table.

The Multiclass Spellcaster table is found here.

And for those with Pact Magic (Warlocks):

Pact Magic. 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 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.

For the example you gave in a comment on this answer:

say my character is stripped of his items and in jail. He could break out of his cell, summon his pact weapon and, with the improved pact weapon invocation, cast darkness to cover his escape. Thing is, an oathbreaker paladin already knows Darkness at lvl 5 and can cast it with a holy symbol, so it begged the question "does he have spend a "known spell" from his warlock class, to cast Darkness with an arcane focus, since he already knows it?" Basically, does he have to know it twice or is he able to cast it as a warlock at lvl 3 and higher

If your multiclassed character does not know darkness as a warlock, but does as a Paladin, you are only able to cast it using a holy symbol as a spellcasting focus, but are free to use either Spellcasting slots or Pact Magic slots to do so (assuming that the slots are of the correct spell level or higher).

Alternatively, instead of a holy symbol or arcane focus, you can use a component pouch.

(You can use a spellcasting focus or component pouch to substitute for the exact material components so long as the material components have no cost and aren't consumed.)

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    \$\begingroup\$ @V2Blast I wasn't sure whether to mention that because the answer by András already covers it? \$\endgroup\$ – Whambulance May 28 '19 at 12:47
  • \$\begingroup\$ I don't think these quoted rules say anything about disallowing using spell slots provided by another class to cast spells. "To cast one of your paladin spells of 1st level or higher, you must expend a slot of the spell's level or higher." and " To cast one of your warlock spells of 1st through 5th level, you must expend a spell slot" do not say that the slot has to be provided by the class from which you learned the spell, just that you have to spend a spell slot of the correct level or higher. \$\endgroup\$ – Protonflux May 28 '19 at 16:06
  • \$\begingroup\$ As per the answer here: rpg.stackexchange.com/questions/120421/… \$\endgroup\$ – Protonflux May 28 '19 at 16:07
  • \$\begingroup\$ @Protonflux You're actually right, I'll double check that but otherwise do you want to post an updated answer seeing as you spotted it? \$\endgroup\$ – Whambulance May 28 '19 at 16:20
  • \$\begingroup\$ @Protonflux Done a bit more surface reading, and I think the ruling stating that spells cannot be cast between Spellcasters is in the multiclassing section of the PHB. However, pact magic slots are the only slots capable of it. I'll check in more detail though \$\endgroup\$ – Whambulance May 28 '19 at 16:35

Yes, if you insist on using an arcane focus

However, you could just provide the components.

Spells are separate

You cannot use your arcane focus to cast your Paladin spells.
Warlock, PHB p107:

You can use an arcane focus (found in chapter 5) as a spellcasting focus for your warlock spells.

However, you can cast your Paladin spells without a holy symbol, using a Component Pouch or some bat fur and a drop of pitch or piece of coal.


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