i found Blind Trap real skill damage is in here
http://irowiki.org/wiki/Binding_Trap
i try to fix it
first i try to make "15% of current HP" work
so i change RL_B_TRAP(battle.c) formula
original formula: md.damage = ((200 + status_get_dex(src)) * skill_lv * 10) + sstatus->hp; // (custom)
my formula: md.damage = tstatus->max_hp * skill_lv * 3 / 100;
and it didn't work only 42 damage(!?)
i can't figure out what's going on