Hey guys, I have a Character a Vampire/Demon Hunter (the Father of the last guy, who didn't quite make it

) and one of his skills is Ancient Languages.
I thought this was pretty cool, as he could understand a 500 year old Vamp speak their native tongue or converse with a Demon in Ancient Hebrew or whatever, however I then realised that the Skill only allows for good understand of 1 Language or passing understanding of 2.
So my Question is what language, or laguages should I take? I want to get the most bang for my buck out of this seldom used skill as I think it has a cool feel to it... so I guess the question is, what Ancient Language do you think would be spoken the most by Vampires, Demons, Mages etc. etc.
The Languages my Character already speaks are:
English, Hebrew, Greek, Aramaic, Latin & German.
If you think one of these would be best replaced by Ancient Language and a different modern language replace it then please say so.
He also speaks a Secret Language and has the Linguist Gift so I guess you can say Languages is somewhat his forte. He is also a Grand Master (4+1) at Reading and Writing, and has Arcane Theroy, Symbol Drawing and Research, so yeah Knowledge is defintely his strong point.
Thanks in advance...
Cheers & God Bless!!
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"It was hard-fought, a desperate affair that could have gone badly; if God had not helped me, the outcome would have been quick and fatal" (115)
~ Beowulf after defeating Grendle's Mother.