*smiles at Doc's post* That certainly is a good start. Begin role playing the desire or need to eradicate undead and back it up with actions. Also, since it does not sound (at least to me) like this is a direction the cleric started out in, it would probably be useful to have a pivotal moment or occurrance that caused this way of thinking.
Six words: Development thread, development thread, development thread.
Then when the development thread is properly advanced resubmit the character in the character submissions section for the prc.
Then apply for a cdq, upon successfull compleation ot the cdq you will be an undead slayer.
side note: it seems that (at least so far) the cdq involves joining a different branch of your Church. Ex. Shining hand for Toran ( I think), and Light Bringers for Aeridin. (I know that one from personal experience) Not sure how exactly a Lucendite would do it.
The only Lucendite I have seen dealing with undead actually summoned a Lich so....... *shakes fist at Celgar*
Good luck on your path to Undead Slayer.
I hope this helped and that I did not miss anything.