Hi, i don't know what that bonus is, but i remember this from old dbo
With each the following combinations you obtain a combo bonus of 13 props.
(17 CON + 30 Hit Rate) & (15% E.Reflect + 30 Res. Rate)
(17 FOC + 30 Hit Rate) & (13% phys. Reflect + 56 dodge rate)
(17 SOUL + 30 Hit Rate) & (13% Phys. Reflect + 10 LP regen)
(17 STR + 30 Hit Rate) & (15% E.Reflect + 10 LP regen)
(17 DEX + 30 Hit Rate) & (15% E.Reflect + 56 dodge rate)
(17 ENG + 30 Hit Rate) & (13% Phys. Reflect + 30 res. rate)
If someone know something about this, please comment