Spectre is a big-ol' boy who you think would be extremely immobile, and you'd be right... unitl he spawns portals!
Spectre can spawn portals on the ground, which gives him an option to:
Quickly teleport to the location (both from the ground and the air)
Stick his hand through the portal to grab opponents on the other side!
Teleport to the portal and perform a powerful corkscrew attack.
You might be able to outrun him on foot, but he will eventually get up close, and with his handy shield that gives him massive damage output and armored attacks on his Strong Normals, you're going to fear for your life at any distance!