Psychic Spark and Magic Missile: the value of one extra dart
Calculate Psychic Spark’s extra dart by spell-slot level, then assess target health, the amulet slot and Shield before choosing it.
Who should receive it first?
Prioritise Psychic Spark for a character who regularly casts Magic Missile. Being a spellcaster alone is not enough: the relevant question is how often the character uses this particular spell. A caster focused on attack-roll spells or concentration control should compare it with the benefits of another amulet.
This is a decision guide based on the listed mechanics. The calculations below cover basic Magic Missile without damage riders, resistance or special interactions; they are not presented as in-game experimental results.
Separate the item's two benefits
The amulet grants a level 1 Magic Missile cast that recharges on a long rest, plus a passive that adds a dart when casting Magic Missile. The additional dart is not restricted to the cast granted by the necklace. A character who already knows the spell can also benefit when casting it with their own spell slots.
Basic Magic Missile fires three darts at slot level 1, each dealing 1d4+1 Force damage. Each higher slot level adds one dart. Psychic Spark adds another dart to that total.
Base expected damage by slot level
A dart averages (1+2+3+4)÷4+1 = 3.5 damage. The amulet's base addition remains 3.5 average damage per cast, so it represents a smaller percentage of the total at higher slot levels.
| Slot | Base darts / average | With amulet / average | Increase |
|---|---|---|---|
| Level 1 | 3 / 10.5 | 4 / 14 | 33.3% |
| Level 2 | 4 / 14 | 5 / 17.5 | 25% |
| Level 3 | 5 / 17.5 | 6 / 21 | 20% |
This shows the item's relative contribution, not a recommendation to spend the highest slot every time. Upcasting by one level also adds one basic dart. Compare the extra finishing damage needed with the value of conserving that spell slot.
When splitting darts, consider minimum damage
Darts can target enemies individually. Against an unprotected target, one basic dart deals at least 2 and at most 5 damage. One can finish an enemy with 2 health, but an enemy with 4 health may survive a single dart despite its 3.5 average. Under the same assumptions, two darts have a minimum total damage of 4.
An extra dart therefore adds flexibility in finishing low-health targets as well as total damage. Conversely, allocating many darts to an enemy that needs only a few can waste damage.
Check attack bonuses and Shield
Magic Missile does not make an ordinary attack roll. Increasing spell attack bonuses alone does not raise its base damage or dart count. ‘Always hits’ does not mean it ignores every defence: the Shield spell blocks Magic Missile, so another offensive option may be needed.
For multi-hit combinations, distinguish triggers such as dealing damage, hitting with an attack and making a spell attack roll. Do not assume every equipment effect activates simply because the spell has several projectiles. Check combat logs separately for combinations sensitive to patches, difficulty or mods.
Acquisition and planner workflow
BG3 Wiki lists Blurg in Ebonlake Grotto, in the Act 1 Underdark, as the vendor. Confirm that the item is available at your current stage and under your playthrough's choices.
- Read the Psychic Spark codex entry for its effect and acquisition information.
- Assign it to the amulet slot of the character who will actually cast Magic Missile.
- Track the item's rest-limited cast separately from casts using the character's spell slots.
- Compare replacement gear and the party-wide trade-off if another character receives the amulet.
The basic damage increase has a clear use for an early Magic Missile caster, but it does not make this the permanent best amulet for every spellcaster. Choose around frequently used actions and the competing equipment slot.