Boost Up (ブーストアップ Būsuto Appu), or "boost-type" (ブースト系 būsuto kei), is a sub-type of the [[:Special:Ask/-5B-5BCategory:Spells-5D-5D-20-5B-5Bspell-20category::-5D-5D-20-5B-5Bspell-20type::-5D-5D|increase-type supportive spells]], developed with the help of Boost Devices. It strengthens the specific existing parameter of the target. In the series, it is one of Caro Ru Lushe and Kerykeion's specialties.