Minako is on lockdown and/or wizard-smiting duty. In addition to the relevant Liminal skills, she has her Questing Country Champion magic, which gives her domain over seals and the administration thereof, including sealing away skills and/or escape paths. Alternatively, she has Armageddon, AKA "Damage Cap? What Damage Cap?: The Spell," so she can potentially explode multiple Illuminants at once, although she's limited to maybe three castings.