- additional resistance (accept negative value)
 - additional max health
 - attack speed modifier (like target_movement_modifier, but affects attack speed rather than movement speed. 0 = cannot attack)
 - crafting speed modifier (0 = cannot handcraft)
 - vision distance modifier (0 = complete blind)
 - light (make the entity glow  
 ) - repeated action, just like poison-cloud. Useful for creating smoke effect on the target.
 
And hopefully the stun effect mentioned in FFF #169 can also be applied on structures (especially turrets).


