Best Illithid Powers in BG3 — Tier List and Which to Take First

S-Tier Illithid Powers (Top Priority Unlocks)

A-Tier Illithid Powers

B-Tier Illithid Powers

C-Tier Illithid Powers (Skip Unless Theme)

What Are Illithid Powers and How Do You Unlock Them?

Illithid powers are passive and active abilities granted by consuming mind flayer parasites (tadpoles) throughout BG3. Your character starts with a tadpole in their head from the Nautiloid prologue — this is the source of the powers. As you progress through Act 1, 2, and 3, you find additional tadpoles in mind flayer corpses, ritual containers, and infected NPCs. Each tadpole you consume unlocks a new power in the Illithid Powers skill tree.

The skill tree has 30+ powers organized in tiers. Each power has prerequisites — most require you to unlock 1-2 lower-tier powers first. The skill tree is character-specific: each party member has their own Illithid Powers screen and their own unlock progression. You can give tadpoles to specific party members to specialize them (give all tadpoles to one character to max their tree quickly).

Consuming tadpoles has narrative consequences. Each tadpole consumed advances your character toward the Mind Flayer transformation — a story event that occurs at specific Act 3 plot points. If you consume enough tadpoles, your character can choose to fully transform into a Mind Flayer (a major story decision affecting endings). Some companion approval responses change based on tadpole consumption — Lae'zel approves of using parasitic powers, Karlach disapproves of feeding the parasite.

There are three tadpole tiers: standard tadpoles (Act 1-2, unlock basic powers), Mature tadpoles (Act 2-3, unlock advanced powers), and the Astral-Touched Tadpole (one-time pickup in Act 3 that unlocks Black Hole — the strongest power). To get Black Hole, you must consume the Astral-Touched Tadpole AND unlock 4 prerequisite powers along the way.

Black Hole — Why It's the Best Power

Black Hole pulls all enemies within 9m to a single point at the center of the effect. No saving throw. Available once per short rest at character level 8+. This is the most powerful crowd-control ability in BG3 because: (1) no save means it always works, (2) 9m radius is huge — it covers most combat encounter sizes, (3) clustering enemies enables follow-up AoE spells like Fireball, Spirit Guardians, or Shatter, (4) Black Hole works on ALL enemy types including bosses, fiends, undead, and constructs that resist most other CC.

The standard Black Hole combo: turn 1, the Black Hole user pulls all enemies into a 1m cluster. Turn 1 of an ally caster (Gale or Wyll), drop Fireball on the cluster. 8d6 fire damage to every enemy in the cluster, average 28 per enemy, 5+ enemies = 140+ total damage from one Fireball. This combo kills swarms of trash enemies in a single round.

Black Hole vs bosses: even single boss fights benefit from Black Hole. Pulling a boss to a specific point lets you isolate it from add-spawns or position it within a Spirit Guardians aura. The 'just pull the boss to me' tactic eliminates positioning advantages enemies have built up over the encounter.

Acquisition requirements: Astral-Touched Tadpole is found in Act 3 (specific story event during the Mind Flayer Colony). You must consume 4 mature tadpoles before unlocking Black Hole — typically: Cull the Weak, Fly, Displace, and Repulsor. Plan tadpole consumption order to reach Black Hole as early in Act 3 as possible.

Recommended Tadpole Unlock Order

1. Favourable Beginnings (entry-tier, automatic from prologue) — minor passive bonus on first turn
2. Cull the Weak (Act 1) — auto-kill enemies under 11 HP, the build's identity
3. Fly (Act 2 early) — Misty Step replacement, no spell slot
4. Displace (Act 2 mid) — swap with enemies for repositioning
5. Repulsor or Force Tunnel (Act 2 late) — group displacement utility
6. Mind Sanctuary (Act 3 early) — Bonus Action becomes Action for one turn
7. Concentrated Blast or Perilous Stakes (Act 3 mid) — high-impact active abilities
8. Black Hole (Astral-Touched Tadpole, Act 3 mid-late) — the capstone power
9. Freecast (Act 3 late) — 1/long rest free spell cast for emergencies
10. Optional final powers based on character role and party need

Story Consequences of Using Illithid Powers

Consuming tadpoles advances your character toward Ceremorphosis — the transformation into a Mind Flayer. In Act 3, you face a choice at specific plot points: continue consuming tadpoles to gain power, or stop and pursue a 'clean' ending. Consuming the Astral-Touched Tadpole (to get Black Hole) crosses a major story threshold and influences your final-act decisions.

Companion approval: Lae'zel (Githyanki) and the more pragmatic companions approve of tadpole use — they see it as a tool. Karlach (idealist) and the more idealistic companions disapprove, viewing the parasite as a corruption. Astarion's stance varies depending on his personal arc state. Approval shifts of -1 to -3 are common per tadpole consumed, but max approval levels mean you can absorb the hits without permanently locking out endings.

Story endings: at the final Act 3 ceremony, you can choose to fully transform into a Mind Flayer (sacrificing your humanity for power) or refuse. Refusing means another character (a companion or NPC) must transform, with different ending implications. Consuming many tadpoles biases you toward the transformation choice — both narratively and through dialogue option availability. Players seeking 'good' endings often limit tadpole consumption to keep options open. Players seeking 'power optimization' endings consume freely.

Roleplay tradeoff: BG3 is built to be playable both ways. A 'no tadpoles' run is fully viable and unlocks 'clean' good endings. A 'full tadpole' run unlocks Mind Flayer transformation endings and lets you experience Black Hole + max powers. Pick based on your preferred narrative experience. Mechanically, the tadpole powers are an enormous combat advantage — Black Hole alone wins fights that would otherwise be very hard.

Illithid Powers vs Standard Class Spells

Verdict: Illithid powers are roughly equivalent to mid-to-high-tier spell slots without the slot cost. The 'free' nature of these abilities is their primary advantage — you get spell-tier effects without prep slot economy. Black Hole specifically has no class spell equivalent in BG3.

Which Party Member Should Hoard Tadpoles?

Verdict: The optimal strategy is to give all tadpoles to your Tav or to Gale — concentrating powers on one character maxes out the tree fastest. Distributing tadpoles evenly across the party leaves each member with weaker partial trees. Gale's Black Hole + Fireball combo is the strongest single-character setup.

Common Illithid Power Mistakes

• Consuming tadpoles without checking the build tree: Each tadpole locks you into a specific power choice (you can't undo). Always look at the unlock screen before consuming — see what each tadpole would unlock.
• Not unlocking Black Hole: If you've consumed tadpoles already, going for Black Hole is the highest-return final pick. Some players stop at mid-tier powers without reaching the capstone — missing the best power in the tree.
• Distributing tadpoles equally across party: Spreading 8 tadpoles across 4 characters gives each character only 2 powers. Concentrating 8 tadpoles on Gale gives Gale 8 powers including Black Hole. Concentrate, don't distribute.
• Worrying about story consequences too early: Most companion approval hits from tadpole use are small (-1 to -3) and recoverable with positive approval choices. Don't avoid powers entirely out of approval fear — manage approval through other choices.
• Skipping Cull the Weak: Cull the Weak auto-kills enemies under 11 HP whenever you damage them. In Act 2 and Act 3 with high-damage AoE spells, this triggers on nearly every Fireball. Free kills = enormous value.
• Saving tadpoles for later: Tadpoles don't expire or change value. Some players hoard them 'for emergencies' and miss out on power tier benefits during entire acts. Consume tadpoles as you find them to maximize power uptime.
• Using Charm in combat: Charm imposes a WIS save. Most BG3 enemies have moderate WIS saves (+2 to +3). Charm fails often. Use Charm only on low-WIS targets or for non-combat skill checks.
• Forgetting Black Hole's once-per-short-rest cooldown: Black Hole is the strongest power but only usable once per short rest. Take 2-3 short rests between major fights to ensure Black Hole is always available for boss encounters.