Heya Luth!
I will try to enlighten with the very few I know (thanks to my all time inlightener HellWraith)...
Well, I don´t think that the word "Lepaca" is something from a specific culture or an invocation...it is my understanding that it is a hebrew word that means "open or reveal". So, put in together with Kliffoth would be: "Reveal to us Kliffoth, or open up...."...or whatever....get the idea? Kind of like when in the chat Markus, FranZ and I would invoke you saying: "Lepaca Luthen" and suddenly u would just pop out.
Now the Kliffoth thing. Therion spells it Kliffoth (they do that a lot, change the spelling of the words), but usually writtings about Qabbalah and stuff spell it as Qliphot...and u might find other variants. So...u have Kabalah (or Qabbalah) which is the "tree of life", a kind of doctrine that some jews practice that mixes magick, teachings and divinity. The Qabbalah cannot deny, though, that there is a "darker" side. When the so called "tree of life" is destroyed, shells are left from its destruction. The shells are now the Qlipphot which is more like the "tree of death" that has eleven "levels". This would more be like the counterpart of the "tree of life" and for every "character there is too it, there is another "charater" that opposes to it in the Qliphot.
We know Chris and his association with DR, they have immersed themselves into the "Left Hand Path" or following the "Tree of death"...
Ok I am very sleepy now...Hellwraith can explain better, but I hope this helped out.
NTSMS has gone Miskolc! 