Can I use 1 Spell slot from Warlock to use both Divine Smite and Eldritch Smite in the same attack? Or I must use 2 spells slots?
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3\$\begingroup\$ Related: "Are you allowed to stack Divine Smite and Eldritch Smite on the same attack?" \$\endgroup\$– Exempt-MedicJan 11, 2020 at 0:41
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2\$\begingroup\$ Oh, but where are our manners! Welcome to RPG.SE! Take the tour if you haven't already and see the help center or ask us here in the comments (use @ to ping someone) if you need more guidance. Good Luck and Happy Gaming! \$\endgroup\$– Someone_Evil ♦Jan 11, 2020 at 9:43
1 Answer
They need each their spell slot
The two features have similar requirements:
you can expend a warlock spell slot to deal an extra 1d8 force damage to the target
(Eldritch Smite; XGtE p. 56)
you can expend one spell slot to deal radiant damage to the target
(Divine Smite; PHB p. 85)
however, these are separate activations (as they are from separate features) and require each their spell slot. If you want to activate both, you would need to expend two slots (one of which will have to be a warlock slot).