Quote Originally Posted by Dire_Stirge View Post
Actually not. It is a common mistake to think it is. Look at the rules for Improving Monsters.



So, we got a human with +0 LA. Now we add the archlich template, which has no listed LA, and thus does not change the human's LA. LA remains +0.
That's already been addressed briefly. But what's also worth noting is that almost no 3.0 Templates include LA even ones that clearly should, Half-Golem for example. And Archlich is 3.0, so it might be worth ruling something in any case it's not reasonable to expect that a DM at an actual table would allow it for 0 LA, even if the rules were that way, and I'm fairly sure that they're not. It wouldn't be a reasonable expectation.