Activated when the obj is targeted by a spell.
Numeric Arg : percent chance this trigger will be activated.
Argument : not used.
Used with return 0 will cause the spell not to be sling.
Variables:
%actor% - the slinger of the spell.
%spell% - the number of the spell.
%spellname% - the name of the spell.
%self% - the object.
Example: TSTAT 90