How to enable an item db like this?

[mujia01]

I look up a JRO weapon that discribe the effect like this:  Deal extra damage to the monsters in the Biolab and nightmare Biolab based on the refine, I try to use the "bonus2 bAddDamageClass,mid,x;"，found out it has a mount limit, can only use to 10 monsters. So how can I enable the actual effect like the weapon discribe ?

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[Start_]

Use RC2 bonus.