In terms of sheer destruction power created by a single individual, the force storm ability
is probably considered to be the most powerful in this respect.
Force storms were basically massive violent wormholes created from the force, that were
capable of destroying entire fleets and even planets.
The most famous user of this power was the reborn Emperor Palpatine when he came back
to life in his clone bodies.
He showed extraordinary skill when demonstrating this power, being able to even create force
storms thousands of light years away from where he was.
He also was able to use the wormhole created by the storm to teleport individuals from
across the galaxy, as he did with Luke Skywalker to capture him.
A drawback to this ability was that if those who used it lost their control over the storm,
they could be killed by it.
Which is what happened to Palpatine when he was temporarily disconnected to the force
by Luke and Leia.
Other force abilities created through sith magic by multiple practitioners have also
shown to create a similar amount of destruction.
The thought bomb was created through Sith rituals by unified sith lords.
It was used by sith lords as a last resort against their enemies, where they would basically
detonate a powerful bomb created from the dark side.
The thought bomb would evaporate everything in its radius, even the sith who created it.
It would also capture the souls of all the force sensitive beings it killed, absorbing
them into a silver orb in the aftermath.
Sith Emperor Vitiate used a similar ability where he tricked thousands of sith lords to
create a dark side bomb, where they destroyed every living being on an entire planet.
But instead of the souls and energies of those killed going into an orb, they were consumed
by Vitiate who became immortal as a result.
Another powerful force ability was force drain.
Although it wasn’t as destructive as the previous few mentioned, it was capable of
killing billions of beings at once while also empowering the practitioner.
Force drain allowed the user to steal the force energy of their enemies, weakening them
in the process, even to death if desired.
One of the most well known users of force drain was Darth Nihilus, who used it to so
often and to such extents that he literally became enslaved by it, where he needed to
drain the energies of his victims just to survive.
It got to a point where he would drain the life force from entire planets, killing everyone
on them, and even then he wouldn’t be fully satisfied.
Through the use of ancient sith artifacts and sith magic, feats like no other could
be demonstrated, like the ability to cause supernovas within suns to destroy entire solar
systems.
Ancient Sith Lord Naga Sadow was able to use this dark side ability simply called supernova
to rip the cores of stars and throw them at his targets, destroying them completely.
Though like many other powerful force abilities, this one was very dangerous and could easily
result in the death of the user.
Other notable force powers include Deadly sight, which gave the user the power to vaporize
enemies that appeared within their vision.
Although this ability could destroy entire groups of enemies within a second, it did
greatly strain and weaken the practitioner, leaving them very vulnerable after its use.
Suppress thought, also known as mind control, was another powerful ability that allowed
the user to greatly influence, and in some cases, to completely control their enemy's
mind.
They could force their enemies to fight for them, and to even commit suicide against their
will.
A very unique and rare force ability was oneness, also known as temporarily becoming one with
the force.
This ability happened randomly to a variety of jedi and sith.
The effects of this ability varied depending on the user, but it usually immensely amplified
the user’s force powers to insane degrees or put the user in a state of mind and gave
them powers that seemed impossible before.
Jacen Solo achieved oneness during the final battle of the Yuuzhan Vong war, where he appeared
as a beam of light, which not only healed him of all his injuries and poisons, but also
destroyed the enemies surrounding him.
Anakin Skywalker achieved this as well, but rather through the help of the Daughter, who
gave Anakin the ability to resurrect Ahsoka and eliminate all the darkness from within
her.
From a Jedi’s point of view, the most powerful force ability that a Jedi could perform was
Sever Force.
This ability gave users the power to block their enemies connection to the force, either
temporary or permanently.
Once the connection to the force was blocked, the victim could no longer use the force in
any capacity, thus rendering them defenseless in that respect.
One last notable force ability we want to include is Battle meditation.
Battle meditation was used to considerably boost the stamina, strength, and morale of
the user’s allies, while also reducing the same effects on their enemies.
When used effectively, it has had turned the tides of entire battles, and even wars.
One drawback to this was if battle meditation was abruptly disrupted, then all those previously
affected by it would become completely uncoordinated and unbalanced, having their boost of power
be cut without preparation to adapt.