Originally Posted by
GramercyRiff
Liches are powerful wizards because they don't age and are extremely hard to kill. They become powerful through their research not because they are liches. Being a lich doesn't make you a more powerful caster (though it does make you harder to kill which I guess indirectly makes you more powerful), it's just the lich form is one of the best for a wizard. The lich's form is resilient and resistant and immune to all kinds of things. This isn't even going into the phylactery.
At any rate we agree that a lich should be more powerful than a wraith. So give the lich more something. I also think giving more DC is a bad idea, but there are good ideas in this thread. The self resurrection is a good one. More caster levels and max caster levels also fits. Some kind of paralyzing attack that can actually work well in the highest difficulties. Etc.