Helical Dart

Helical Dart is an Uncommon relic in Slay the Spire 2 that deals 3 damage to a random enemy whenever you play a card that costs 0. This passive damage effect turns your zero-cost cards into dual-purpose tools that both execute their normal function and chip away at enemy health.

The 3-damage pings may seem small individually, but they add up rapidly in decks that play many zero-cost cards per turn. Shiv-based builds, which generate and play multiple 0-cost Attack cards each turn, can trigger Helical Dart 5 or more times in a single turn, adding 15 or more free damage on top of the Shivs' own damage. This transforms Helical Dart from a modest bonus into a significant damage source.

Helical Dart synergizes powerfully with any strategy that generates or reduces card costs to zero. It pairs well with Mummified Hand, which makes cards free when Powers are played, and with Madness, which permanently reduces card costs. The relic is less impactful in decks with few or no zero-cost cards. For dedicated zero-cost strategies, Helical Dart is a cornerstone relic that significantly amplifies your damage output.