My DM does not believe that you can use a warlock's spell slots to cast other casting classes' spells at your warlock spell slot level except via the feat Magic Initiate. How can I convince them that you can? Where is this explained in the core books?

For example: you are a Bard 1/Warlock 5. Can you cast the bard Cure Wounds spell using one of your two 3rd-level warlock spell slots? Does the Cure Wounds heal 3d8 + Cha mod instead of 1d8 + Cha mod? If so, where in the PHB or DMG can I find this?

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    \$\begingroup\$ You should revise your example. You cannot cast 2 spells of 1st level or higher within the same turn. Also, Prayer of Healing has a 10 minute cast time, which would preclude it's use in combat. \$\endgroup\$ – Pyrotechnical Mar 24 '17 at 23:13
  • \$\begingroup\$ I can't tell precisely what this is asking. Is it "can I cast cleric spells using warlock slots", or is it "when casting cleric spells with warlock slots, is the spell cast at the level of the warlock slot"? Or is it something else? \$\endgroup\$ – SevenSidedDie Mar 24 '17 at 23:20
  • \$\begingroup\$ @SevenSidedDie I believe it's the first, because their DM is disallowing the Warlock's spell slot to be used by other casters. So it can't be the second, since they don't yet have that problem. \$\endgroup\$ – user27327 Mar 25 '17 at 3:33
  • \$\begingroup\$ @markovchain The wording before suggests otherwise — that there is something about the slot level at issue. Your edit would be a reasonable question, but reasonableness doesn't guarantee it's actually the question. I've reverted the speculative edit — the OP is active enough and they can clarify it themself. \$\endgroup\$ – SevenSidedDie Mar 25 '17 at 14:00
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    \$\begingroup\$ Ok! Example Bard 1 Warlock 5. Can you cast the Bard's Cure spell using one of the two Warlock's spell slot of 3rd level? Does that Cure of 1d8 + Cha mod then becomes 3d8 + Cha mod? If so where in the PHB or DMG can I find this? \$\endgroup\$ – Jhyarelle Silver Mar 26 '17 at 6:12

Yes, you can use warlock slots to cast any spell you know. It's in the PHB in the section on multiclassing. Page 164:

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.

The effect is determined by the slot's level, as always in D&D 5e.


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