Inspired by the scene when Unalaq pulled Raava spirit from Korra. Also, the shoutout goes to
@Dragonboy1712 suggestion, including his abilities that I will be listing in this thread.
Let's start with a scenario: A huge fightning, or you know, the casual If you will, is happening between a dark spirit and a light spirit. Both of them manage to get closer to each one another (in a 1 block gap). Now, here's the fun stuff happens...
Introduction: Both of these two avatars have the capaticity to pull out their legendary spirit from one another, via command (see it below). The Avatar that wishes too pull the spirit from the other needs to be in the avatarstate, otherwise it won't work, but (s)he will be notify that it's required for the command to work. Once the command is executed, the "spirit" (particles), aka Raava/Vaatu, will begin to leave user's body to pull the counterpart spirit out from the target. This process will last for 30 seconds, at the mean for it to become successful and complete, the targeted avatar should stay in place unmoved, and no injuries should be inflicted to the user. Therefor, it is recommended that the avatar's victim is restrained from his/her movements and that there is no risk of him trying to bend from your help, let it be by the aid of freezing him in an enclosed place.
The Command is: /avatar spiritform
After the effect is done, both of these two avatars will leave their body into a form of Raava and Vaatu. To distinguish 'em, the avatars will become lightly transparent, with the addition of having loads of particle with the aura on them that match their avatar color (glowstone for light spirit, endermen for dark spirit). They will gain the power of flight and their current binds will change into the
following ones and with a few other ones that fill up all the 9 slots.
One of the avatars can return to their body with the command
/avatar return, but the other must die while in this spirit form or unti they both flee apart from each other in a greath distance, or you can just wait for 5 min. for your spirits to automatically return in your bodies. As you probably expected, this will have a very long cooldown to prevent this power for being over abusive.
Another thing, while your physical bodies are vulnerable to any attacks and damaging surroundings, leaving a chance it to be fatally killed, you will still live on until your spirits get destroyed as well (using the return command also kills you).
That's pretty much it.
