Turret deployment

Three questions for the mechanic

• Is the new source announced before it attacks?

  Show the landing socket, turret silhouette, firing direction, and activation delay before the shot. Do not let a harmless placement marker resemble an active hitbox.

• Can the player clear the committed lane?

  Measure ordinary movement from the worst legal starting point, including acceleration and the full body radius. Leave a reachable side corridor and keep the turret fixed while this lane fires.

• When does the extra threat end?

  Bind beam damage to the visible beam, then remove both on shutdown. If the turret can be destroyed early, specify its health and cancellation rule; otherwise show its finite duration clearly.

Design mistakes

• The turret fires on the placement frame

  The player cannot read a new attacker and its lane instantly. Give the deployed object an unmistakable warm-up.

• The lane tracks without a new signal

  A rotating or retargeting barrel changes the safe corridor. Either lock its aim for the burst or mark and test every subsequent turn.

• An invisible turret still shoots

  Damage after the beam or turret fades breaks the visual contract. Tie collision to the same activation and shutdown states as the art.

Tune the attack

• Represent the emplacement as an independent object

  Store a fixed socket, warm-up timer, aim vector, firing width, lifetime, and optional health. The boss's later motion must not move the turret or silently change its committed aim.

• Check lane clearance with the whole body

  Sweep the player's collision shape from each allowed starting position to the side corridor. A path is safe only when its nearest distance from the active segment exceeds beam half-width plus player radius.

• Bound overlap and cleanup

  If more than one turret can exist, cap their count and verify that their lanes do not close every exit. On timeout, destruction, or phase transition, clear the beam hitbox and its effects together.

• Vary one deployment parameter at a time

  Change the socket, wind-up, firing duration, or lane angle only with a cue that preserves the learned rule. An independently tracking turret is a different response problem.

Arena

• What the mechanic communicates

  Kern seats a small rune stone in the arena. It unfolds into a fixed sentry, charges a straight seam of light, and goes dark before the next exchange.

Player upgrades

• Adapt it to the player verbs

  Basic movement must clear the lane. A sword strike could optionally destroy a reachable turret, but its travel time, attack range, health, and damage cancellation need separate testing; the demonstration does not require that upgrade.

Do not confuse this with

• Keep the mechanic distinct

  A turret is a placed, stationary attacker with its own firing rule. A summoned minion may chase or choose new attacks; a mine waits for a trigger and usually resolves once; a moving hazard carries its damaging area through the arena.