The sarrukh are a reptilian progenitor race in the Forgotten Realms, fleshed out in the Serpent Kingdoms supplement.
Here's a wiki link:
http://forgottenrealms.wikia.com/wiki/Sarrukh
They are justly infamous as an example of poor monster and game design in 3e. The sarrukh were given the power in their stat block to modify members of the reptilian subtype, capable of giving them better attributes. The concept being that the sarrukh's hook was that they were sort of magical super-geneticists, capable of creating reptilian super-beings to do their bidding. The ability was very open-ended and would be screamingly abusable in a PCs hands. The most infamous case being Pun-Pun, I believe. There, a kobold (and therefore a member of the reptilian sub-type) was written up using various 3e rules to gain the sarrukh's ability and use it to enhance his own stats to arbitrarily high levels.
Frankly, I consider the sarrukh simply an example of rotten design, no matter what the system. I don't think any game system would have stopped that bit of nonsense. You'll note that it happened without a 4e style encouragement of special monster abilities. Actually, a system like 4e that encourages the idea that monster abilities are in a very separate category from PC abilities and shouldn't be available to PCs by some kind of default game design would have stopped Pun-Pun in his tracks.