Dragonborn Fiend Patron Warlock Build Guide
Combine the Dragonborn's innate elemental resistance with Fiendish Resilience at level 10 to become an unkillable blaster, soaking damage while slinging Fireballs.
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Why Fiend Patron?
The Dragonborn Fiend Warlock is a 7/10 build that leans heavily into the blaster role. While most Warlocks rely entirely on Eldritch Blast for consistent damage, the Fiend Patron hands you the best AoE spells in the game, like Fireball and Wall of Fire. Adding the Dragonborn chassis to this mix gives you a resourceless Breath Weapon to clear out low-HP minions without burning your precious Pact Magic slots, allowing you to trigger Dark One's Blessing reliably.
Where this build truly shines is in its defensive layering. Warlocks are notoriously squishy with their d8 Hit Dice and light armor. However, by combining your Draconic Damage Resistance with the 10th-level Fiendish Resilience feature, you can effectively make yourself resistant to the two most common damage types in any given dungeon. Throw in Draconic Flight to keep out of melee range, and you become a floating artillery platform.
The main drawback here is your lack of Darkvision and low Wisdom (10). You'll need to rely on the Light cantrip or allies to see in the dark, and you are highly susceptible to control spells. However, Dark One's Own Luck at level 6 provides an emergency 1d10 to save your skin when targeted by a nasty Hold Person.
Fiend Patron Features
Dark One's Blessing
Level 3When you reduce a hostile creature to 0 hit points, you gain temporary hit points equal to your Charisma modifier + your warlock level (minimum of 1).
Fiend Spells
Level 3You gain additional spells that count as warlock spells for you: Burning Hands, Command (level 1); Blindness/Deafness, Scorching Ray (level 3); Fireball, Stinking Cloud (level 5); Fire Shield, Wall of Fire (level 7); Flame Strike, Hallow (level 9).
Dark One's Own Luck
Level 6When you make an ability check or saving throw, you can add a d10 to your roll. You can do so after seeing the initial roll but before any of the roll's effects occur. Once you use this feature, you can't use it again until you finish a short or long rest.
Fiendish Resilience
Level 10When you finish a short or long rest, you can choose one damage type. You gain resistance to that damage type until you choose a different one with this feature. Damage from magical weapons or silver weapons ignores this resistance.
Hurl Through Hell
Level 14When you hit a creature with an attack, you can instantly transport the target through the Lower Planes. The creature disappears and hurtles through a nightmarish landscape. At the end of your next turn, the target returns to the space it previously occupied (or the nearest unoccupied space). If the target is not a fiend, it takes 10d10 psychic damage as it reels from its experience. Once you use this feature, you can't use it again until you finish a long rest.
Recommended Ability Scores
Dragonborn Traits That Benefit Fiend Patron Warlock
Breath Weapon
Extra saving throw advantages protect against debilitating spells and effects.
Draconic Flight
Flight provides incredible mobility, letting the Warlock reach otherwise inaccessible positions.
Draconic Ancestry
Breath Weapon provides AoE damage that martial Warlocks otherwise lack.
Damage Resistance
Built-in damage resistance reduces incoming damage, keeping your Warlock alive longer in combat.
Combat Effectiveness
| Level | HP | Melee DPR | Spell DPR |
|---|---|---|---|
| Level 5 | 33 | 3.9 | 9 |
| Level 11 | 69 | 3.58 | 12.38 |
| Level 17 | 105 | 3.58 | 16.5 |
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Build Path (Levels 1-20)
Levels 1-4
Start with a stat spread of STR 8, DEX 14, CON 13, INT 12, WIS 10, CHA 15. Take Eldritch Blast immediately. At level 3, you gain your first major subclass spikes: Dark One's Blessing and your expanded Fiend Spells. Dark One's Blessing grants you temporary HP (CHA mod + Warlock level) whenever you drop an enemy—use your Dragonborn Breath Weapon to guarantee killing blows on weakened swarms. At level 4, take the Fey Touched feat to round your Charisma to 16 and pick up Misty Step.
Levels 5-10
Level 5 is massive: you unlock 3rd-level Pact Magic slots, meaning you can cast Fireball twice per short rest. You also gain Draconic Flight, allowing you to rain fire from above. At level 6, Dark One's Own Luck comes online, giving you a 1d10 to add to crucial concentration checks for Wall of Fire. At level 8, take your ASI to bump Charisma to 18. At level 9, you reach your maximum Pact Magic slot level (5th level), unlocking Flame Strike. Level 10 grants Fiendish Resilience; coordinate this with your Draconic Ancestry resistance to cover multiple elemental bases.
Levels 11-16
At level 11, you receive your 6th-level Mystic Arcanum. At level 12, use your ASI to cap Charisma at 20, maximizing your spell save DC and the THP from Dark One's Blessing. At level 13, you select your 7th-level Mystic Arcanum (take Forcecage). Level 14 brings Hurl Through Hell. Because this triggers on an attack hit, you can proc it with a single beam of Eldritch Blast, banishing an enemy and dealing 10d10 psychic damage.
Levels 17-20
At level 17, you secure your 9th-level Mystic Arcanum—Foresight is the optimal choice here to grant yourself advantage on every Eldritch Blast attack roll and disadvantage on incoming attacks. With 20 Charisma and level 17+ scaling, Dark One's Blessing is now feeding you 22+ temporary hit points every time you kill a creature. Finish out your ASI at level 19 with Resilient (Constitution) to round out your CON to 14 and secure your concentration checks.
Recommended Spells
Cantrips
Eldritch Blast is non-negotiable; it is the engine of your single-target DPR. Take Minor Illusion for utility and Mage Hand to interact with objects safely from a distance.
Level 1-2 Spells
Avoid Armor of Agathys—its temporary HP conflicts directly with Dark One's Blessing. Instead, take Command from your Fiend Spells list; upcasting Command with higher-level Pact Magic slots scales incredibly well. Keep Hex for single-target boss fights.
Level 3-5 Spells
Fireball is the reason you play a Fiend Patron; cast it often. Wall of Fire provides excellent battlefield control. At 5th level, Synaptic Static is a fantastic non-concentration AoE blast that targets Intelligence saves, which complements your Fireball spam against fire-resistant foes.
High-Level Spells
For your Mystic Arcanum, take Mass Suggestion at 6th level (no concentration required). Forcecage at 7th level is an instant-win button against melee brutes. At 9th level, Foresight turns you into a hyper-consistent blaster, ensuring almost every Eldritch Blast beam hits to potentially trigger Hurl Through Hell.
Recommended Feats
Fey Touched
Take this at level 4. Bumping your Charisma from 15 to 16 is mathematically necessary, and getting Misty Step without burning a precious Pact Magic slot is vital for a squishy blaster. Choose Silvery Barbs or Gift of Alacrity for your 1st-level spell.
Resilient (Constitution)
Take this at level 12 or 16. It bumps your odd Constitution of 13 to 14, granting you more HP, and adds your proficiency bonus to CON saves. When you're maintaining concentration on a 5th-level Wall of Fire, you cannot afford to drop it from a stray arrow.
Metamagic Adept
A phenomenal late-game choice for a Fiend Warlock. Taking Quickened Spell allows you to cast a massive Fireball as a bonus action, leaving your action free to use your Dragonborn Breath Weapon in the exact same turn for devastating burst AoE.
Gear Progression
Tier 1 (Levels 1-4)
Acquire Studded Leather as soon as possible for a baseline AC of 14. Seek out a Bloodwell Vial +1 or a Wand of the War Mage +1 to ensure your early Eldritch Blasts consistently hit.
Tier 2 (Levels 5-10)
Upgrade to a Rod of the Pact Keeper +1 to boost both your spell attacks and your Fiend spell save DCs for Fireball. A Cloak of Displacement is excellent here, forcing disadvantage on attacks against you and preserving your Dark One's Blessing temporary HP.
Tier 3 (Levels 11-16)
Hunt for a Staff of Fire. As a Fiend Warlock, having extra casts of Fireball and Wall of Fire that don't consume your two or three Pact Magic slots completely fixes the Warlock's inherent resource management problem.
Tier 4 (Levels 17-20)
You want a Robe of the Archmagi to set your base AC to 15 (17 with DEX) and give you advantage on saving throws against spells. Combine this with a Rod of the Pact Keeper +3 for an astronomical spell save DC.
Party Composition
Your role is the primary Blaster and secondary Controller. Because your Pact Magic slots are heavily invested in AoE damage (Fireball) and battlefield division (Wall of Fire), you need a robust frontline to keep enemies clustered together.
An Ancestral Guardian Barbarian or Oathbreaker Paladin makes a perfect anvil to your hammer. They lock enemies in place, allowing you to maximize your AoE damage. Furthermore, pairing with a Grave Domain Cleric is a lethal combination; their Path to the Grave feature can inflict vulnerability on a boss right before you trigger your 10d10 Hurl Through Hell, turning it into a 20d10 psychic nuke.
Multiclass Options
Fighter 2
Starting Fighter 1 gives you Heavy Armor and Constitution saving throw proficiency. Taking a second level for Action Surge is arguably the strongest blaster dip in the game. Action Surge allows you to cast two leveled spells in a single turn—dropping two 5th-level Fireballs back-to-back will end most encounters instantly.
Sorcerer (Divine Soul) 1
A single-level dip provides the Shield and Absorb Elements spells, which you desperately need since you lack the slots to cast them as a pure Warlock. Favored by the Gods stacks with Dark One's Own Luck, virtually guaranteeing you'll never fail a vital saving throw.
Common Pitfalls
- Casting Armor of Agathys: Temporary hit points do not stack in 5e. If you cast AoA, the THP will constantly overwrite or be overwritten by your Dark One's Blessing feature, wasting your spell slot.
- Overlapping Resistances: If you are a Red Dragonborn (Fire resistance), do not choose Fire for your Fiendish Resilience at level 10. Always pick a damage type you don't already resist, like Poison or Bludgeoning.
- Wasting Hurl Through Hell: Hurl Through Hell deals psychic damage. Do not use it on mindless constructs or undead that are immune to psychic damage, or you waste your 14th-level feature entirely.
- Hoarding Pact Slots: Fiend Warlocks are designed to short rest. If you reach a short rest with a 5th-level slot unspent, you've wasted potential Fireballs. Spend your slots aggressively.
More Questions
Can I trigger Hurl Through Hell with a spell attack?
Does Dark One's Blessing trigger if an ally kills the enemy?
Can I use Dark One's Own Luck on Counterspell checks?
Which Draconic Ancestry is best for this build?
Strengths & Weaknesses
Strengths
- ♦ Fiend Patron grants Dark One's Blessing at level 3
- ♦ Strong species-class synergy enhances core abilities
- ♦ Versatile spellcasting options
- ♦ Built-in damage resistance improves survivability
Weaknesses
- ♦ Low Wisdom — vulnerable to common saving throws
- ♦ No Darkvision — may need light sources in dungeons
Pro Tips
Use your Dragonborn Breath Weapon to finish off weak minions, guaranteeing a trigger of Dark One's Blessing for fresh temporary HP.
Save Dark One's Own Luck for crucial concentration saving throws to keep your Wall of Fire active.
Change your Fiendish Resilience damage type immediately after a short rest based on the dungeon environment.
Trigger Hurl Through Hell using a single Eldritch Blast beam to remove a boss from the map for a full round.
Cast Command from your Fiend Spells list using a 5th-level slot to force up to five enemies to skip their turns.
Other Warlock Subclasses for Dragonborn
Other Races for Fiend Patron Warlock
Frequently Asked Questions
Is Fiend Patron a good subclass for Dragonborn Warlock?
What makes Fiend Patron different from other Warlock subclasses?
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