The Spider ability allows Kirby to use spider webs to trap enemies.
The webs themselves persist for a few seconds after being released, and any non-invincible enemy that comes into contact with a web will be encased in a web themselves.
Once trapped, enemies can either be thrown towards other enemies or grabbed and thrown. Kirby and his friends can bounce on the webs created by Spider's attacks to gain height using a friendship ability called Friend Bounce.