Slam did not work on magical creatures until December 1999. After this, you could equip magical shoulders and it would hit the mob.
Source:
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				Povarian  
posted December 01, 1999 06:51 AM    
 
Please post a status on this BUG. I and my whole group died again in CT cuz I was unable to SLAM the steel golem, while wearing my crafted gloves (magic) and wielding my Exec Axe (2hander magic). 
Thank You 
 
A True Warrior who will not settle for using 1handers to fight, mes love mes axe and mes wanna use it all da time!!!! 
  
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Robert Hill 
posted December 07, 1999 05:01 PM 
 
This has been fixed on the Test Server. It be necessary to have a magical item equipped on characters shoulder to achieve a slam on magical creatures. This should be updated on Wed. Dec. 8. 
 
Robert Hill 
Lead Tester 
EverQuest 
 
http://web.archive.org/web/200004110...ML/000016.html
			
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 Verant was using the DrTwister.com forums as an informal bug source for a few months in 99.
Edit: Here's Rob Hill today, because I'm creepy: 
http://www.gamesauce.biz/tag/robert-hill/
Fix is corroborated in patch notes for Dec 8th 1999: