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Specifically, I want to attack 4 times with Eldritch Blast as a 17th level Warlock. What is the easiest and cheapest way to gain advantage on all 4 attacks?

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    \$\begingroup\$ Incidentally, I'm pretty sure Enhance Ability doesn't grant advantage on attacks - attacks are not ability checks. \$\endgroup\$
    – Miniman
    Sep 19, 2014 at 4:29
  • \$\begingroup\$ I am confuse. How on earth are you supposed to get four attacks as a Warlock? Did they have Extra Attacks in the playtest? \$\endgroup\$
    – trekkieyk
    Sep 26, 2015 at 2:51
  • \$\begingroup\$ I was totally looking at the class, and forgot to look at the spell description. \$\endgroup\$
    – trekkieyk
    Sep 26, 2015 at 17:45
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    \$\begingroup\$ You aren't using Eldritch Blast 4 times at Level 17. A single cast of Eldritch Blast produces 4 beams, each with a separate attack roll. \$\endgroup\$ Jun 12, 2016 at 16:06

6 Answers 6

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TL;DR
Play a drow warlock, and take the eldritch invocation Devil's Sight. Faerie Fire grants advantage against any creature illuminated by it. Devil's Sight allows you to see in magical darkness, and the Darkness spell grants advantage.


Other ways of gaining advantage:

Being Unseen
From PH 194:

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

Conditions
If any of these apply to your target then you will have advantage:

  • Blinded
  • Paralyzed
  • Petrified
  • Prone (and attacker within 5')
  • Restrained
  • Stunned
  • Unconscious

Class Abilities

  • Cleric with Trickery domain. At level 2 they can use Channel Divinity to create an illusionary double. If both you and your double are within 5' of the creature then you have advantage.
  • Paladin with Oath of Vengance. At level 3 they can use Channel Divinity for the Vow of Enmity that gives them advantage on attack rolls against 1 creature
  • Rogue with Assassin archetype. At level 3 they gain the Assassinate ability and have advantage on any attack rolls against creatures that haven't taken a turn in the combat yet

Spells
Any spell that inflicts one of the earlier conditions or causes you to become unseen (eg - Blindness/Deafness, Greater Invisiblitiy) will give you advantage. These spells specifically grant advantage:

  • Faerie Fire
  • Foresight
  • Otto's Irresistable Dance
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  • \$\begingroup\$ I think you are missing one more. Under class abilities of Monk under Monastic Traditions under Way of the Shadow at 6th level you get Shadow step and that gives you advantage if you use shadow step and use a melee attack on the same turn after the teleport. \$\endgroup\$
    – Progredi
    Jul 24, 2015 at 23:39
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    \$\begingroup\$ Nice list, but one problem- Eldritch Blast is a ranged attack, so if you do it from 5' away the disadvantage will cancel out the advantage from Duplicity. \$\endgroup\$ Jun 12, 2016 at 13:26
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    \$\begingroup\$ You can't cast Faerie Fire and Darkness at the same time; both take Concentration. \$\endgroup\$ Jun 12, 2016 at 16:10
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    \$\begingroup\$ @Progredi You can't have 6 levels of Monk and 17 levels of Warlock, and Eldritch Blast isn't a melee attack. \$\endgroup\$
    – T.J.L.
    Jun 13, 2016 at 12:41
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    \$\begingroup\$ @briddums Yes; suggest you edit the opening paragraph to firmly state that it is "Faerie Fire and Pact with Archefey" or "Darkness and Devil's Sight." \$\endgroup\$ Jun 15, 2016 at 2:41
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The best way to do this - Have an ally cast Greater Invisibility on you. An Invisible attacker has advantage automatically, and with Greater Invisibility you can attack without losing the Invisibility. This will grant you advantage for as long as the spell persists.

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  • \$\begingroup\$ Is that assuming your target does not have blind sight or tremor sense? \$\endgroup\$ Jun 20, 2016 at 14:09
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    \$\begingroup\$ By a strict RAW reading of the Invisible condition, it doesn't actually matter whether the target can see through Invisibility or not. I can't guarantee your DM won't throw a book at your head if you tell him this, though. \$\endgroup\$
    – Miniman
    Jun 20, 2016 at 14:13
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    \$\begingroup\$ "An invisible creature is impossible to see without the aid of magic or a special sense." Then, in an entirely separate dot point, with no connection drawn between the two: "Attack rolls against the creature have disadvantage, and the creature's attack rolls have advantage." \$\endgroup\$
    – Miniman
    Jun 20, 2016 at 15:03
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    \$\begingroup\$ @Miniman I'm sorry but I don't see how it makes logical sense to be able to negate invisibility but not its effects. \$\endgroup\$ Jun 20, 2016 at 17:38
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    \$\begingroup\$ It doesn't say anything about negating the Invisible condition. And I said a RAW reading, not a logical one \$\endgroup\$
    – Miniman
    Jun 20, 2016 at 22:36
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Ways to get advantage

  • Use inspiration
  • Have stealth
  • DM rules you have it because of something situational
  • target is suffering from a condition that grants advantage

Only reliable option: On a previous turn (yours or a party member's) someone will have needed to inflict a status like restrained on the target.

The only reliable way to have advantage for that many attacks is to be making them against a target that is restrained or paralyzed.

I find it highly unlikely that even if 4 members of the party had inspiration that they would give it up to you for the nova round you are trying to build. Stealth + your own point of inspiration is still only 2 attacks. DM fiat is too situational to rely on and even still would probably only net you 1 use of advantage.

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  • \$\begingroup\$ Flanking exists in 5e right? not sure the exact rules on it as I dont have my book near by. but if the enemy was flanked by the allies wouldnt all the attacks have advantage? \$\endgroup\$
    – MC_Hambone
    Sep 18, 2014 at 19:21
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    \$\begingroup\$ Flanking doesn't really exist anymore. It's been reduced to "a rogue can sneak attack if an ally is beside the creature" \$\endgroup\$
    – briddums
    Sep 18, 2014 at 19:54
  • \$\begingroup\$ There are optional flaking rules in the PHB, but iirc it's only for melee attacks. \$\endgroup\$ Aug 27, 2023 at 23:21
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The cheapest method is to take the Devils Sight Invocation combined with a darkness creating spell, like Darkness or Hunger of Hadar.

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If this is all you want your high level warlock to do is get advantage on eb - take 13 levels rogue(archane trickster) and use free action to slap your target with your mage hand to give you 4 eb's with advantage.

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  • \$\begingroup\$ How exactly are you supposed to have 13 levels of rogue when you're a 17th-level warlock? \$\endgroup\$ Jun 13, 2016 at 20:56
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    \$\begingroup\$ @DanHenderson If you're a 13/4 Rogue/Warlock, you're character level is 17, giving you 4 beams for Eldritch Blast. \$\endgroup\$ Jun 14, 2016 at 0:56
  • \$\begingroup\$ @DrunkCynic ah, you're right, I missed that attribute of cantrips. \$\endgroup\$ Jun 14, 2016 at 14:42
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A familiar can 'Help' you granting advantage on your first attack roll. The Owl seems the best at this.

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