ToV - Yuri Lowell: Artes

Altered Artes (スキル変化技 - Skill Henkawaza)
Altered Artes are activated in place of their original arte during battle, if the required skills are equipped. After the original arte has been used more than 100 times (or more than 50 times for magic artes), the altered version will be learned as a separate arte, which no longer requires the skills to be equipped.

Burst Artes (バーストアーツ)
Burst Artes can be activated only while Over Limit mode is active. The burst arte duration, damage, and effects are increased with Over Limit levels, with maximum effects at Level 3. Similar to altered artes, burst artes can be "altered" if the correct skills are equipped. However, these elemental burst artes cannot be learned separately. All burst artes are activated by holding the "Artes" button during any arcane or altered arte.