Well, I don't know what this mechanic looked like in the original game, back in the day, but if I were to do it, it would probably be something like this.
1. Make the boss have an
Script added, which with each start of the animation of the walking would draw a number from 1 to 10, if the number draws, for example, 1 then several mines will be spawn on the map at different time intervals.
-- OR --
2. Make the boss could throw projectiles in the same way as sucubus, or incubus (you would then have to write a script that made the mine a projectile, or take the script from the projectile rose from sucubus).
-- OR --
3. Add a timer to the "update.c" script, which would turn on with the start of the level. when the timer reaches the right number then spawn the mine and reset itself. You can always still add that the timer instead of a specific number would only check a variable and change it depending on the amount of hp of the boss, for example, if 100%hp - 0, 50%hp - 20 sec, and so on. Plus, add a short draw number from the range of, for example, 60 - 200 for the X axis of the mine respawn.
