After the end of the war, the Citadel was rumored by individuals to have been cursed and haunted. However, an old garrison of Separatist battle droidscontinued to operate within the facility, led by a malfunctioning droid acting on an adjusted final directive to target all Force-sensitives. Said directive thereby led to the imprisonment of a Force-sensitive youngling within the Citadel, subsequently resulting in a climactic battle at the facility with a Jedi warrior to free the child. Later, by the time of 9 ABY, Lola Sayu fell under the jurisdiction of the New Republic, holding prisonerssuch as Unga Toba, who was serving a twenty-five year sentence on the planet for unlawfully accessing a computer.

What can damage that planet? super weapon can crack and partly destroy a piece of the planet

According to the wiki page, it was an “unknown event”

What do you think about the super weapon that partly destroyed Lola Sayu

Not an unknown event but something else entirely

I think it is possible that the damage Lola Sayu has endured was caused by a superweapon.

But what kind of super weapon

I think it's a super laser weapon like the Death star

Definitely possible