I've read about half this thread and skipped to here so apologies if the discussion has moved on? Anyway, I'm playing a 13th level half elven fiend pact blade lock (started at 4th). We've been playing razor coast for the best part of a year. The party consists of me, a Druid/barbarian, a vengeance paladin, a bard and an evoker wizard. I've really enjoyed playing this character. He doesn't hit the hardest, hasn't got best ac/hp, doesn't cast the most spells. However, he does hit pretty hard, takes a fair bit of taking down due to temp hp/AoA etc.., has a dangerous ranged attack.
In addition, in the absence of a rogue he can be sneaky when needed and with a good mix of invocations he can do all sorts of other cool stuff - Devils sight, mask of many faces etc.. Oh, and he's a real charmer, smooth talking and persuasive. I've gone down twice in combat - once to a megalodon bite and once to getting cut to ribbons by a marelith.
Also, the DM has had great fun with my patron. My character is besotted with an Erinyes who is an agent of my patron and he'll do ANYTHING for her!
This class doesn't feel broken to me. I think the party impress each other on a regular basis. The only issue that seems to worry our DM is the huge hit point soak of the Druid/Barb but it's not removed any enjoyment?
Hex and concentration. We allow it to roll through short rests. It doesn't seem to 'break' the spell? And I'd say that's how the designers intended it, but I think it should have been a class feature, personally?
My one criticism of the class. As a blade lock, I think thematically with the gift of this awesome weapon you should feel obliged to use it. But it is always not quite as good as EB which is a shame. But I ignore that and always close if I can. Some would consider this sub optimal! Ha ha!
So in answer to the op, yes, choose warlock! It's a (not necessarily eldritch) blast!
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