Landmine allows Chitose to turn anything she’s touched into an explosive that can be detonated at will.
The explosives she creates are noted not to be very strong, but they’re still powerful enough to deal a lot of damage to a person if they’re used in numbers.
Chitose uses her Quirk very strategically by planting traps for her opponents to walk into. With the support of her followers, she can force her targets into specific areas on the battlefield where her mines can detonate and injure them.
Chitose's Quirk also works on human beings and her followers are willing to be turned into bombs for her. In order to counter Himiko Toga's Transform Quirk, Chitose used her Quirk on her own team so that their blood would explode on demand.
The Curious Flattener weapon allows Chitose to use her Quirk at close range by detonating small pieces of her transformable chain ring. She uses this weapon to counter Himiko at close range by exploding her face.