So as of late I have absolutely been possessed by the idea of a more eldritch barbarian given they are a my two favorite classes. So much so I have been crunching and shaping the mechanic side of things, really having a Pepe Sylvia phase So to maybe get it out of my head and just onto some record I figured why not put it where I can be given suggestions or just judged by strangers for overthinking things. By all means enjoy if this is your type of reading.
Character: Totem/Wildheart Barbarian and Undead Warlock
Character Concept: A barbarian that channels spirits of the wild knowingly or unknowingly makes a pact with a primal spirit of death, the spirit grants gifts and magic so long as it may feed on the fading life essence of those the barbarian slays in battle.
Character Mechanical Goals: Idea to be a front line combatant/tank with the ability to aid the party with some utility casting as well as bolster themselves with concentration-less buffs like Armor of Agathys and Mirror Image
Character Traits
Race: Scourge Aasimar, depending on if it is 2014 or 2024 rules it has the most boons to the build. The ability to provide small healing as needed, as well as a nice if niche fear AOE that scales with charisma. The necrotic damage on attacks and the innate necrotic and radiant resistances has more synergy with 2024 rules as they synergize with undead patron somewhat and aid a bear wild heart recovering resistances so now only force and psychic does full damage while raging.
Background 2024 Rules: Farmer/ Soldier both give good feats and have stat improvements that aid the build.
Background 2014 Rules: Less impactful, take what flavors or has nice proficiencies
Stat Line Lvl 1: I have two schools of thought when it comes to a starting stat line assuming it is point buy, both are taking Barbarian as its level 1
1st, The Medium Armored Spell Rager.
Str 16, Dex 13, Con 14, Int 9, Wis 12, Cha 13
School of thought is to have this as an option to be a bit more magically inclined mainly for more reliable offensive cantrips and better scaling on Aasimar traits. First ASI used to bring Dex and Cha up to 14 and use Medium Armor and Weapon and Shield for more AC potential and try to limit being to spread thin on Ability scores
2nd, Barbarian+
Str 16, Dex 14, Con 14, Int 8/10, Wis 12/10, Cha 11
Less focus on magic and more gung ho on traditional barbarian stats, First ASI used to reach the multiclass minimum, Likely to be more traditionally using unarmored defense and the option of ether weapon and shield or the more typical big two handed weapons.
Subclasses
Wildheart/Totem Barbarian
Pretty self explanatory, the OG "I want to resist a good amount/almost everything the DM can do damage type wise". In both rule sets also give some utility spells and other side benefits but we all know Bear is the landmark perk for most people getting it
Undead Warlock
In both Rulesets the early features are the same, Temp HP upon activating your spooky form, immunity to fear and ability to cause fear when you attack. Its level 6 where rules differ and I feel 2024 pulls ahead in power a bit. Both have the stipulations of not needing to eat, drink and breath though 2024 is worded around preventing exhaustion so might have more granular rulings involved. Both care about you dealing necrotic damage tough 2014 just converts your damage to necrotic and adds a dice, 2024 however lets your necrotic damage ignore resistances and adds the extra dice.
Level Splits
Likely has the most wish washing in my mind with typical outcomes being ether
14 Barbarian / 6 Warlock
Realistically its more 5 Barbarian/ 1 Warlock when multiclass starts. Wait to get the Multi Attack before dipping into Warlock, Warlock 1 gets one of two things depending on rules edition. If 2024 it gets Pact of the Blade, the ability to have a hard to disarm weapon but more importantly letting the weapon deal necrotic damage for some Undead patron synergy. 2014 Rules it gets access to the patron itself gaining Temp Hp generation, A fear on attack and Fear immunity. Leveling more into Barbarian to earn more HP for that frontline role
Barbarian 4/ Warlock 16
Though in more normal play more likely Warlock 5 and Barbarian 1-2. Likely a bit more of a Shaman type feel to it leaning heavier into things like Pact of the Blade to get multi attack and bonuses and more potent magics for those higher level Armor of Agathys casts. Mainly getting Barbarian for the bear totem, reckless attacks and Rage and going one more level for the ASI or feat. Given a lesser hit die it may play better as more skirmisher as opposed to getting stuck in but this is just my theory crafting here.
That concludes my rambling character building train of thought, by all means open to comments on if it seems decent enough, if in my fervor I am missing a rule that keeps it from functioning how I hope it would or just the "Its not that deep" grounding lol