This is proof that you've equipped items that activate a Group Union bonus skill. Each basic skill group has a skill corresponding to each of the five elements. It doesn't matter where on your equipment you have the skills equipped; just equip all five skills in a group to form a Group Union!
This is proof that you've equipped items that activate a Stack bonus skill. You can get Stack bonuses by equipping more than one copy of the same skill at once. The more copies of that skill you equip, the cooler your Stack bonus will be!
This is proof that you've equipped items that activate an Elemental Union bonus skill. Basic skills all correspond to one of five different elements. Equip skills of the same element that line up directly adjacent to each other, and you'll form an Elemental Union based on how many skills are in the line. Check it out on the skill sheet!
158
863
2365
8300
Very Rare 5.2%
Common 56.5%
Ultra Rare 1.5%
