item script that will be triggered when HP is critical

[zHep]

hello guys!

i am hoping that someone can help me on this.

i'm trying to create a custom item that will give a bonus effect if character's HP is below 20%( or his HP bar turns red ). Then if he regains HP and made his HP above the required HP rate, the bonus effect will disappear too.

ex. A custom dagger that when HP is below 20%, it will give you ATK+100.

i tried experimenting on item bonus script, but im afraid that it would make my server crash.

 thanks in advance!

[Emistry]

..........................,{ if( Hp <= ( MaxHp / 5 ) ) { BONUS } },{},{}