A_Countdown
From ZDoom Wiki
A_Countdown
(no parameters)
This can only be used on projectiles. It counts reactiontime down until it reaches 0 and then explodes the projectile.
Examples
actor RevenantTracer2 : RevenantTracer { reactiontime 25 states { Spawn: FATB AB 2 bright A_Tracer // See RevenantTracerSmoke FATB A 0 A_CountDown loop Death: FBXP A 8 bright FBXP B 6 bright FBXP C 4 bright stop } }
This Revenant missile will follow the player until its animation has played 25 times, upon which it will then enter its death state.