spike attack

Im making a boss fight and one of the attacks i wanna ad is a spike attack. Basically what i plan on doing is the boss will spawn an invisible armor stand and tp it to the player. The armor stand will indicate that a spike will emerge out of the ground with particles. Then after half a second a spike made out of particles will come ou and will damage the players standing on it. i figured out i can do this with dx. Though i dont quite understand the dx mechanics. can you help me out?