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Since a warlock's familiar can be a Quasit (which can turn invisible) and a familiar can be used to deliver the warlock's touch spell, it should be able to deliver a touch spell like plane shift1 (when used on unwilling creatures) while invisible.

But does the familiar get advantage on the attack? The wording of the Unseen Attackers section is quite specific about saying “you”, which I interpret as the caster, not the familiar:

When a creature can’t see you, you have advantage on attack rolls against it.

Does the Advantage apply or not?


1) Plane Shift is horrible as an offensive spell. However, this question might be relevant for Multiclassed warlocks.

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    \$\begingroup\$ Related: When a wizard's familiar attacks, who's the attacker for the purposes of Invisibility? \$\endgroup\$ – GreySage Oct 6 '15 at 22:39
  • \$\begingroup\$ @Bash very good point, but now that I was looking, I did not find any offensive Warlock spells with the range of touch. If you do, feel free to edit it in. \$\endgroup\$ – András Feb 20 at 15:23
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    \$\begingroup\$ If you don't like the pact of the chain warlock + plane shift example, you do not need multiclassing to use another one : a simple wizard could cast invisibility once, and benefit from 2 different touch spell attacks (one from the familiar and one from himself) ; or a pact of the chain warlock may learn shocking grasp using a feat. But you are right, a sorcerer/warlock will have most uses of this trick. \$\endgroup\$ – Bash Feb 21 at 12:38
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Yes, advantage applies

Why? The you in the unseen attackers sections is referring to whatever creature is invisible / can't be seen. In this case it is your familiar, and it would have advantage even though it uses your attack modifier.

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    \$\begingroup\$ This is important - otherwise only PCs would ever benefit from invisibility. \$\endgroup\$ – GMJoe Oct 6 '15 at 22:44

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