This passage is in The section on Tattoo Magic on Page 142... 3rd Paragraph... 1st sentence.
The magic tattoos augment the recipient and when seven or more are applied, make him into a superhuman with Supernatural Strength and Endurance and an MDC body.
The rest of the paragraph goes on to state how T-Men acted historically in both Atlantean culture and in the various Splugorth Empires.
Now, I am sure that some will try to suggest that this section is trying to explain how Tattoo Magic works for Atlanteans alone, since it is being printed in a book about Atlanteans. However, at this point in the Tattoo Magic discription, the magic is only being referenced in general terms. The sentence above doesn't specify JUST Atlanteans... it states that recipients of magic tattoos are all transformed in this way... when the magic works for a given species (of which, only humans, elves and orges are known to have this magic work for them... and Atlanteans are still fundamentally human).
This means that the slave T-men OCCs presented in World Book 2 will also get Supernatural Strength and Endurance when they recieve their seventh tattoo... and that both write ups of the Tattoo Warriors in Conversion Book 2 (Endiku Longhair on Page 64 and Ares the Renegade on Page 104) are in error since neither was given the Supernatural Strength that both should receive.
As for the other observation I made about what happens to the Hit Points and SDC of these Tattoo Men when they become MDC beings, I will admit that I am basing it off of the MDC information presented in the Atlantean racial discription on Page 47 of SotA... namely the the section that deals with MDC for Atlanteans. While this might be a unique case exclusive to Atlanteans (since it is in their racial discription), it is not in the Natural Ablity section where one would expect unique abilities that ONLY apply to Atlanteans to be. No... it is instead in a section that confirms that Atlanteans are NOT normally MDC beings and explains how the magic transforms them from normal SDC mortals into MDC superhumans.
To recap this process, it appears that Hit Points and SDC (from physical skills) skills are also converted into MDC and added to what is provided by the Tattoos, plus 1d6 MDC per level. Healing damage taken for MDC beings in this manner seems to be at the normal rate for their species (same rate at which they heal Hit Points/SDC).
Since the Atlantean race is still fundamentally human (numerous places within numerous books keeps saying that Atlanteans are still human, even if they are more advanced), it is reasonable to conclude that if the Tattoos function in this manner for Atlanteans, it should function in the same way for the less advanced humans that are the prefered reipients used by the Splugorth. Furthermore, since humans and Ogres seem to be related (with Ogres being less advanced as the Atlanteans are more advanced), then logically the interaction should also behave the same for them as well. Finally, by referencing the above passage from SotA where it states that all who recieve magical tattoos are tranformed in the same way, it would suggest that the traformation is more or less the same for all who use the magic, which would include the rare Elves forced to use this magic (due to the rather severe penalties, it seems unlikely that any elf would willingly get this magic).
I am hoping that this time people will be more civil when discussing all of this, but I do believe that at least as far as the first part is concerned... ALL T-Men O.C.C.s (whether Atlantean or Splugorth Slave) have Supernatural Strength and Endurance. That debate seems definitively ended.