Once A Hero has been upgraded to +8, they can start using “Specialty”. In speciality you sacrifice 5* Frags to create random tiles, and place tiles in specified orders to gain boosts. Luckily there is a gallery to explain the boosts, but it takes a long time to earn all the tiles, and then figure out how to palce them optimally for your hero.
Optimising for your Hero
Fighter Layout

Effects
Fighter | Shooter | Rider | Troop |
ATK +40 | ATK+20 | ATK +20 | |
DEF+10 | DEF+45 | ||
HP+10 | HP+10 | HP+10 | HP+45 |
Shooter Layout

Fighter | Shooter | Rider | Troop |
ATK+20 | ATK+40 | ATK +20 | |
DEF+10 | DEF+45 | ||
HP+10 | HP+10 | HP+10 | HP+45 |
Rider Layout

Fighter | Shooter | Rider | Troop |
ATK +20 | ATK+20 | ATK +40 | |
DEF+10 | DEF+45 | ||
HP+10 | HP+10 | HP+10 | HP+45 |
Fighter/Shooter

Fighter | Shooter | Rider | Troop |
ATK +40 | ATK+40 | ||
DEF+10 | DEF+10 | DEF+10 | DEF+50 |
HP+10 | HP+10 | HP+10 | HP+50 |
Fighter/Shooter/Rider

Fighter | Shooter | Rider | Troop |
ATK +40 | ATK+20 | ATK+20 | |
DEF+10 | DEF+10 | DEF+10 | DEF+50 |
HP+10 | HP+10 | HP+10 | HP+50 |
Fighter/Rider

Fighter | Shooter | Rider | Troop |
ATK +40 | ATK+40 | ||
DEF+10 | DEF+10 | DEF+10 | DEF+50 |
HP+10 | HP+10 | HP+10 | HP+50 |