[RPG] Can a Swordsage become a Lich

Not really, until high levels. As written, it's designed to blend classes and seems to have very steep requirements such that many dips are typically necessary to enter it in any reasonable timeframe. Take a look at the shadow sun ninja, as that seems to feature in many swordsage builds.

Examining links here, here, here, and here.

The only text on master of nine seems to be:

• Hypothetical builds on the boards tend to time this class for late in the build so as to acquire high level maneuvers. But if you're not starting at a high level then entering early has its benefits (e.g. I'm a big fan of Dual Stance so would want it asap), and it gives you full progression of your likely ultiple Martial Adept classes ready to re-enter them for some higher level maneuver swaps. In practice I would compromise, take 2/3 MoN levels as early as I could manage and then leave the rest for high level maneuver acquisition and a high level stance of choice (nb: 8th level maneuvers are often better than the 9th level ones imho).
• Counter Stance + Stance of Alacrity combo
• Mastery of Nine: ready at start of day from as many disciplines as possible to maximize bonus, then spend 5 minutes changing them as desired.

Looking at the literature, there seem to be no builds that are strongly Swordsage and master of nine. If you're looking to be a frontline swordsage ... Here are some builds:

• The galaxy
• Heaven of Nine
• Master of nine/swordsage dominant, but not int-high
• Another dex-high. Are you sure you want to play a str-high swordsage?
• Str high, swordsage ninja, eventually.

My suggestion, click through here and see what catches your eye.

It's a variant on Lich

Good Lich is a variant template; you alter Lich with the information found in Good Lich (and presumably remove the requirement to commit an act of 'unspeakable evil') and apply the resulting template to the character. Among other things, Good Lich increases Lich's CR and Level Adjustment, which would affect the character taking it as an option.