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I was just reading this on an online max-DPR build and there were some who thought using the metamagic twinned spell on the warlock cantrip was illegal, and some who thought the opposite.

Twinned Spell, PHB page 102 (emphasis mine)

When you cast a spell that targets only one creature and doesn't have a range of self, you can spend a number of sorcery points equal to the spell's level to target a second creature in range with the same spell (1 sorcery point if the spell is a cantrip).

So can the sorcerer's Twinned Spell metamagic class feature be used with Eldritch Blast?

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  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$ – mxyzplk May 18 '18 at 1:57
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Only when the caster is below 5th level

The errata for the PHB has clarified the restriction further from the original printing:

To be eligible for Twinned Spell, a spell must be incapable of targeting more than one creature at the spell’s current level.

By default, eldritch blast does not have a range of self and is capable of targeting only one creature. It is thus eligible to be twinned.

However, the spell becomes capable of targeting more creatures once the caster reaches level 5:

The spell creates more than one beam when you reach higher levels: two beams at 5th level, three beams at 11th level, and four beams at 17th level. You can direct the beams at the same target or at different ones. Make a separate attack roll for each beam.

Thus, once the caster reaches 5th level and above, they can no longer twin eldritch blast.

Note that eldritch blast (and all other similar cantrips) scale with character level not class level as confirmed by Jeremy Crawford.

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  • \$\begingroup\$ It there's only one target .... this answer falls a little flat. \$\endgroup\$ – KorvinStarmast May 17 '18 at 22:00
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    \$\begingroup\$ @KorvinStarmast It doesn't matter how many targets there are. All that matters is that the spell is capable of targeting more than one thing. Note the wording "a spell must be incapable of targeting more than one creature". This has been confirmed in errata (seen in my answer) and JC rulings (ie here, here, and here among others). \$\endgroup\$ – Rubiksmoose May 17 '18 at 22:03
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    \$\begingroup\$ ok, the errata seems to be pretty solid. I was relying in a pre errata memory \$\endgroup\$ – KorvinStarmast May 17 '18 at 22:13

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