The highest expected damage is 366.292
Carolinus, the half-elf in question has the following classes:
Warlock (Hexblade) 5 ------- (for Hexblade's Curse, Pact of the Blade, Improved Pact Weapon, Eldritch Smite, and 1 ASI)
Bard (College of Swords) 10 - (for Blade Flourish, Extra Attack, spell slots, true strike and 2 ASI)
The best I found so far is: Hexblade 7, Swordbard 8, Battlemaster 3, Paladin 2
That way you are looking at a total of 8d6+30d8+88, which averages at 251, ignoring crits and misses.
You use your ASI to get Elven Accuracy, Great Weapon Master and to get Cha to 20.
You need Eldritch Smite and Improved Pact Weapon as invocations. You need Feinting Attack and ...
For a pact of the chain warlock, spell damage is going to nearly all of the damage inflicted as the cantrips are as effective as a ranged weapon would be.
Eldritch Blast is the bread and butter
It's a cantrip, so this is the default and aligns well with the consistent non-resource intensive option. It may not do the most damage in a day, but it's going to ...
The familiar attacks immediately, consuming your bonus action.
The text for this Boon says simply:
As a bonus action, you can command your familiar to make one attack.
There is no mention of a delay, nor an additonal cost to the familiar, therefore there isn't one.
For comparison see the Ranger Revised's beast companion (also Unearthed Arcana):
Immediately during your bonus action.
The Pact of the Chain Pact Boon (PHB, page 107) states,
Additionally, when you take the Attack action, you can forgo one of your own attacks to allow your familiar to use its reaction to make one attack of its own.
This means that the familiar will immediately use its reaction and make an attack, replacing one of ...
You can try a Whispers Bard/Hexblade multiclass.
Both classes rely on Charisma, Hexblade allows you to use you charisma for attack/damage bonuses
Jack of All trades covers for anything you couldn't do before as a Warlock. At level 9 its a +2 to anything you aren't proficient in.
Psychic Blades: At Bard6/Warlock3, you'll be able to use your pact weapon to ...
The feat needs trimming before playtest
Based on the consensus in the three answers above, the feat will take this form.
Feat: Eldritch Adept
Prerequisite: Warlock level 4
1. Gain one invocation of your choice from those available to the Warlock, and for which you qualify.
2. Gain one additional cantrip from the Warlock spell list.
Note for ...
No, not necessarily
I can think of several ways that a patron may not know their warlock. A lot of this is DM dependant and may depend on the setting, so your milage may vary.
The relationship between your Warlock and their Patron may be akin to the story of Prometheus - the man who stole fire from the gods. However, unlike Prometheus, you are ...
If you haven't already, I'd recommend taking a look at the Unearthed Arcana that discusses feat-building. I'm not a fan of the feats in that particular article myself, but I do appreciate what it has to say on the design philosophy of feats.
That said, let's tackle your feat from a different perspective. As mentioned, determining balance just by looking ...
Depends on the patron, depends on the campaign
In my campaign, fiends run an entire market in mortal contracts with the result that a warlock’s patron might suddenly change as their pact is bought and sold. However, in this situation, it’s the warlock who doesn’t know who their patron is - the patron does; in the same way Apple or General Electric know who ...
It Seems Very Strong Compared to Magic Initiate
The closest PHB parallel to this feat would seem to be Magic Initiate, which allows knowing one 1st level spell to be cast once without a spell slot (unless you are certain classes and subclasses taking it for your own class). Invocations are somewhat comparable to knowing spells as many of them involve ...
It is possible for a patron not to know their warlock
As you quote in your question:
The Great Old One might be unaware of your existence
And, as I assume you are aware based on your use of that quote:
At 1st level, you have struck a bargain with an
otherworldly being of your choice: the Archfey, the
Fiend, or the Great ...
The language in the warlock section is filled with "pacts" and "bestowing gifts" and such - all very much implying the patron is not only aware of their warlocks but actively acting upon them. I would submit on this language alone that a patron must be aware they have warlocks.
The sections for the most patron types seem to follow this assumption pretty ...
At first look, it look slightly unbalanced...
Looking at strictly PHB feats, all of the "half feats" (Where it's +1 to an ability score and some other boon) consist of the +1 and one other big boost; mostly proficiency of some kind. With the occasional fluff piece.
Examples of the single boost are
added hit ...
It is still possible to hide from them
Starting with the wording of Ghostly Gaze:
As an action, you gain the ability to see through solid objects to a range of 30 feet. Within that range, you have darkvision if you don’t already have it. This special sight lasts for 1 minute or until your concentration ends (as if you were concentrating on a spell). ...
It does prevent Devil's Sight
As seen in the PHB list of spells:
Devil's Sight. You can see normally in darkness, both magical and nonmagical, to a distance of 120 feet.
Private Sanctum. The barrier of the warded area appears dark and foggy, preventing vision (including darkvision) through it.
And having the creative intention behind Devil's Sight ...
An imp's invisibility does not end when taking the Help action
The Help action states:
[...] Alternatively, you can aid a friendly creature in attacking a creature within 5 feet of you. You feint, distract the target, or in some other way team up to make your ally's attack more effective. If your ally attacks the target before your next turn, the first ...
Much depends on the circumstances that led to the restrained condition in the first place.
Restrained is a higher level status condition than Grappled. Not only is movement impeded, but actions too. Some abilities impose just the grappled condition, and others impose restrained in addition to, or on top of grappled.
Only in a case where ...
Depends on how they're restrained.
Since you've clarified that the creature is trapped in the coils of a giant snake, no, they won't get released. Repelling Blast throws the snake backward; this won't untangle whatever is wrapped up in it.
But the Grappled condition says...
The condition also ends if an effect removes the grappled creature from the ...
A restrained creature will be free.
Grappler feat (Players Handbook pg 167.) gives a character the ability to restrain another. Spells do what they say they do and the repelling blast would cause the creature targeted (grappler) to be moved as that is the effect of the feature. In this case, the creature (being held) who was not a target of the effect, ...
It can be done as early as level 5 by a Divine Soul Sorcerer
(+3 the three levels of Warlock you have listed)
The Warlock Levels give us the ability to use short rests to regain level 2 slots that can also be used to generate sorcery points, or to cast gentle repose to keep the bodies intact to cast revivify.
By converting sorcery points into level 3 ...
Warlock 5, Cleric 5
When considering options for consistently resurrecting creatures, Revify (3rd level spell) is clearly the way to go, since otherwise we'd need access to 5th level slots. This does pose a problem however, since Revify only works within a minute of death, and the Chronicle of the Raven Queen invocation also requires a minute to work....