Need a script for a 'Spider Impaler'

[bigantennaemay]

Well, after many unsuccessful attempts of my own, I'm asking for help with a script for a particular magical effect that I want to apply to a sword I'm making. What I'm looking for is a Morrowind script that can be applied as a weapon enchantment that only activates when the weapon strikes a Centurion Spider, terminates when the attack is over, and what I want it to do is one, and only one, of a number of things (whichever is easiest):

 

• cause an additional 10 damage to the Centurion Spider
  
• cause an additional 0-10 damage to the Centurion Spider
  
• cause the PC's attack power to increase by 10 for the duration of one attack (sword swipe)
  
• cause the PC's attack power to increase by 0-10 for the duration of one attack
  
• cause a fortify attack spell to take effect on the PC with magnitude 0-10 or 1-10 for a short duration, the duration of an attack, or 1 second
  

 

Against all other creatures and NPC's the script should not be activated, but the weapon should be able to do damage as normal (without this effect added on). It is essential that this script can be used as a spell, or enchantment, because I don't want the weapon to retain the ability to be enchanted. If anyone could write this script, your help would be appreciated. Also, I'm aware that there are two Centurion Spiders in the CS, so if it's too much trouble to make this script affect both of them, just do what I did, and try to make it work just for the more common of the two varieties.