Iustitia / Docs / Combat / KillAura

KillAura

[!] Corroborator
Unified killaura / silent-aim detector ported from Rain-Anticheat's 1.8.9 KillauraCheck. Seven sub-components share one VL pool: heuristic(aim|constant|sync), pattern(snap), silent(snap|return|track), movement(fix|lock|sprint), consume. Silent-aim swaps yaw/pitch only in look packets so the head visibly snaps onto enemies while the cheater's screen never moves. Tier status: corroborator only — a lone KillAura alert marks a player yellow, and it contributes to red only alongside a primary definitive check (reach, criticals, throughWalls, etc.).
id: killAura  ·  class: KillAuraCheck  ·  group: Combat

What it detects

Unified killaura / silent-aim detector ported from Rain-Anticheat's 1.8.9 KillauraCheck. Seven sub-components share one VL pool: heuristic(aim|constant|sync), pattern(snap), silent(snap|return|track), movement(fix|lock|sprint), consume. Silent-aim swaps yaw/pitch only in look packets so the head visibly snaps onto enemies while the cheater's screen never moves.

Observer signature

Subscribes to SwingSignal + AttackEvent, runs every tick. Windowed rotation heuristics over 10 non-zero rotations: heuristic(aim) if machineKnownMovement > 8, heuristic(constant) if constantRotations > 6, heuristic(sync) if robotizedAmount > 8; pattern(snap) on both-direction +-12deg streak. Burst machine detects yaw bursts (>=7deg step, <=7 ticks, sum >=20deg); silent(snap) when a burst settles inside a target hitbox with >20deg pre-error, on the 3rd qualifying hit at level 2.5. silent(track) when yaw stays inside a target hitbox bearing on >=0.85 of 24 fast-LOS-rotating ticks. movement(fix|lock|sprint) use body/head desync. consume flags attack while using a consumable >6 ticks within 33 of last eat.

False-positive guards

  • Attacker-in-vehicle exempt (rotations/consume unreliable)
  • Teleport/lag guard — large position step (>25) clears windows and resets burst machine
  • Combat-gated (rotations outside 70 ticks of a swing ignored), session reset after 140 out of combat
  • consume gated on isUsingConsumable (not bare usingItem) so shields/bows don't FP
  • Movement component requires flat ground, speed 0.15-0.45, not in hurt window, not on ice, chunk-unloaded fails negative
  • Trails pruned (>80 entries -> remove tick - 200 stale)

Configuration

Defaults (editable in-game via the YACL config screen or /ius config):

FieldDefault
enabledtrue
setbackVL5.0
decay0.05
threshold0.0
combat window70 ticks
rotation window10
quantum1.40625deg
track window/ratio24 / 0.85
VL silent(snap)2.5 (clears VL5 in ~2 hits)

Source

src/main/kotlin/dev/iustitia/checks/combat/KillAuraCheck.kt  ↗