Theorylytics

Event Horizon

Used by Sirius & Orion

Ability7
Energy50Orion ability

Event Horizon

Orion forms a drifting black hole, trapping enemies within its gravity. Hitting the black hole with Gravitic Slash or Coronal Ejection will extend its duration and change its trajectory: Gravitic Slash will direct it away from Orion, and Coronal Ejection will pull it towards Sirius. (HOLD) Swap to Sirius and use Light's Sanctuary.

Introduced in Update 43.0 (2026-06-17)

Ability stats

Strength
  • 300 / 450 / 600 / 750 Heat on collapse
Range
  • 5 / 5 / 8 / 8 m black hole
  • 8 / 10 / 11 / 12 m explosion
Duration
  • 10 / 12 / 16 / 18 s
  • +5 s when hit by slash/ejection
Misc
  • 50 energy
  • Ragdoll pull; 1 black hole limit
  • Hold to swap → Light's Sanctuary

Info

  • Event Horizon is Orion’s ability 7 on the Sirius & Orion dual kit.
  • Orion forms a drifting black hole, trapping enemies within its gravity.
  • Holding most 1–3 abilities swaps control to the other son and casts their paired ability instead.
  • Constellation Stars from casts feed Celestial Clash — build stars before you need the nuke.

Tips & Tricks

  • Cast while moving forward to accelerate the hole; cast still/back to crawl it into a choke.
  • Collapse on recast for the Heat burst, then immediately throw a fresh hole.
  • Group enemies for melee combo and Celestial Clash AoE setups.
  • Only Orion’s Duration extends the hole when Gravitic Slash / Coronal Ejection connect.

Ability dossier · Event Horizon

Verified 2026-07-23

Synergies

  • HoldLight's Sanctuary

    Swap to Sirius’s heal/revive well after grouping.

  • Event Horizon ← Gravitic Slash / Coronal Ejection

    Redirect and extend the hole.

  • Event HorizonCelestial Clash

    Black-hole clumps are ideal Clash radius food.

Mod Scaling

Strength

Strength scales Event Horizon’s damage and key effect values — mandatory on nuke/strip/heal paths.

Duration

Duration matters on Event Horizon when the ability is timed (buffs, zones, black hole, motes).

Range

Range grows Event Horizon’s hit radius, vacuum, or explosion — high priority for tile clear.

Efficiency

Base cost 50 energy — Efficiency plus swap passive keeps dual casting cheap.

Priority

Strength and Range first for clear; Duration for zones/shell/motes; Efficiency for long missions.

Mission Use Cases

MissionHow to Use It
Steel Path Survival / Defense / DisruptionTest whether Event Horizon still clears or enables clear when enemies are dense and overlevelled.
Mobile Defense / ExcavationUse Event Horizon to control or delete the swarm on the objective, then reposition.
Exterminate / Capture Speed RunsCast Event Horizon only when it saves time — skip it on empty tiles.
Spy / Rescue / Quiet RoutesIf Event Horizon is loud or forces combat, save it for after the vault; if it’s stealth-friendly, use it to stay safe.

Comparisons

  • VS

    Vs similar tools on other frames — Event Horizon is tuned for Sirius & Orion’s loop — don’t judge it as a standalone subsume without the rest of the kit.

Other Sirius & Orion abilities