Bonus effect is edited in propItemEtc.inc / .txt
Open .txt to find set IDS, excample Lv 60 mercernary set.
IDS_PROPITEMETC_INC_000027 Recorn Set
Open .inc and search for IDS_PROPITEMETC_INC_000027
Code:
Elem
{
II_ARM_M_MER_HELMET_SET_04 PARTS_CAP
II_ARM_M_MER_SUIT_SET_04 PARTS_UPPER_BODY
II_ARM_M_MER_GAUNTLET_SET_04 PARTS_HAND
II_ARM_M_MER_BOOTS_SET_04 PARTS_FOOT
}
The first part is looking for what items are in this set, in this situation, the helmet, suit, gauntlets & boots..
Code:
Avail
{
DST_ATTACKSPEED 400 4
DST_HP_MAX_RATE 15 3
DST_ADJDEF 28 3
DST_ADJDEF 22 2
}
Second part is the bonus effect.
DST_ADJDEF 22 2
You get this effect when 2 parts of the same set is being equipped.
DST_HP_MAX_RATE 15 3
DST_ADJDEF 28 3
You get this effects when 3 parts of the same set is being equipped.
DST_ATTACKSPEED 400 4
You get this effect when all parts are being equipped (The 2, 3 & 4 tells how many parts you need to equip to get the bonus)
Hope this helps.