The Ophion Demon pull can pull objects and enemies towards where you are. During combat, this will usually bring the enemy over to where you are which is useful as this tends to also separate them from a group. You should be careful on which enemies you use this on however because some enemies will simply deflect it or be too big for it to be used normally.
However, most enemies that are protected from it for some reason are still susceptible to it in certain circumstances. For instance, if you use it on the back of Tyrant (when the icon appears), you will pull him down on the floor so you can attack him. This also goes for some enemies that will allow you to use this to help you defeat them or perhaps even require you to use it to defeat them.
This ability also allows you to get around. In certain situations, if you use it on a red anchor point, you can pull a piece of land or other object towards you. This usually has the effect of providing a platform for further progress but in some cases it will just open a door that allows you to pass through. It can also be paired with the Enemy Step ability. If you jump into the air, pull an enemy up and jump off them, you can repeat the final two steps indefinitely. This allows you to reach whatever the highest point in the area is. This can also help you get to some hard to reach spots or perform more mid-air combos.
This ability has an upgrade called Kicker that causes you to kick the enemy as they are pulled to you. To perform this, perform the pull as usualy, stay in Demon mode and then hit the x/square button just as they are about to bump into you and you should perform the kick.
You'll acquire this ability during Mission 2 - Home Truths.
