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One of the other players is making a Polearm Master Fighter, so I'm thinking of building a Repelling Blast-spamming Sorcerer/Warlock to help the fighter to block off choke points. Polearm Master allows you to make an OA whenever someone enters your reach, and together with Sentinel that drops their speed to 0. So the idea is to push enemies into awkward positions where they have no choice but to run back into the Fighter's reach. It's basically a light 2-person version of 4e's awesome Polearm Momentum build. This trick doesn't help with ranged enemies, but for them I'll instead try to push them into the Fighter's reach (or maybe get Grasp of Hadar to pull them?).

Of course, I'll be using the usual Quickened Spell trick to fire off a bunch of Eldritch blasts.

I figure it would also be nice to take advantage of the Sorcerer's Twinned Spell and Haste to turn the Fighter (and whoever else has at least 2 attacks) into a killing machine.

Since I'll just be using Twinned Haste and spamming my Quickened Eldritch Blast, the rest of my build choices are pretty open-ended. I figure that the Hasted Fighter will probably be doing the bulk of the party's damage, so I'm thinking of filling a supporting role to some extent.

What other support-themed choices would be good fits for this build? It seems like the usual wisdom with an Eldritch Blast build is Warlock 2/Sorcerer X. Should I stick with this or would it be worth taking more Warlock levels (or levels in a different class entirely)?

All official sources and Unearthed Arcana are allowed (with DM permission).

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closed as too broad by Miniman, KorvinStarmast, user27327, Pyrotechnical, Oblivious Sage May 4 '17 at 12:56

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ @KorvinStarmast Opportunity Attacks they trigger on movement that consumes your action, bonus action, or reaction. That's why Dissonant Whispers triggers OA even though the movement is forced (ie, their failed save forced them to move through a very specific path against their will). \$\endgroup\$ – user27327 May 4 '17 at 12:35
  • \$\begingroup\$ I'm thinking of using Repelling Blast to help the fighter to block off choke points. Polearm master allows you to make an OA whenever someone enters your reach, and together with sentinel that drops their speed to 0. So the idea is to push enemies into awkward positions where they have no choice but to run back into the fighter's reach. It's basically a 2-person version of 4e's polearm momentum build. This doesn't help with ranged enemies, of course, but for them I'll instead try to push them into the fighter's reach (or maybe get Grasp of Hadar later?). \$\endgroup\$ – ಠ_ಠ May 4 '17 at 12:40
  • \$\begingroup\$ @KorvinStarmast Yep, you're right. Repelling Blast will not trigger OA. The querent will have to MC Bard for DW instead if they want to key off this idea. As a bonus, a Bard/Sorc with Warcaster and Booming Blade plays this OA-triggering style much more flavorfully and in a more mechanically sound way. \$\endgroup\$ – user27327 May 4 '17 at 12:41
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    \$\begingroup\$ Great Old One Pact allows you to take Dissonant Whispers without MC Bard, but that's a good spell suggestion. \$\endgroup\$ – ಠ_ಠ May 4 '17 at 12:44
  • \$\begingroup\$ How many people are in your party? Just you two, or others? How far do you expect this build to go -- 8th? 12th? 15th? (Most campaigns don't last until level 20). Does it matter to you which class starts: do you want to start Warlock or start Sorcerer? Does this game start at level 1, or at a later level? Your What other support-themed choices would be good fits for this build? is probably why this is closed as too broad. We aren't good at idea generation, please see this meta post. \$\endgroup\$ – KorvinStarmast May 4 '17 at 14:12