I'm looking for some Irish Black Metal with or without a slight pagan/traditionalist vibe. The rawer the better. I already listen to plenty of Primordial and am not really looking for bands that sound too similar to them. Thanks in advance. Happy St. Patrick's day!

I've been fairly thoroughly through the Irish metal scene, and there's actually quite a limited amount of bands.
However, here's all the black metal bands I know, that I enjoy:

Altar of Plagues

http://www.youtube.com/watch?v=F1-7wBP70MQ

Beithíoch

http://www.youtube.com/watch?v=gZXeZ8fxaTY

Cruachan

http://www.youtube.com/watch?v=mbyTcNn0-lM

Eternal Helcaraxe

http://www.youtube.com/watch?v=g9pzCfvE-8U

For Ruin

http://www.youtube.com/watch?v=t17dkzJrLm0

Myrkr

http://www.youtube.com/watch?v=z3LO860AF6A

Slidhr

http://www.youtube.com/watch?v=JTgNmUHfRJ8

Sol Axis

http://www.youtube.com/watch?v=6hxyj8lzDcE

EDIT: Oh, and on a topical note, happy St. Patrick's Day!

Haud Mundus - http://www.youtube.com/watch?v=HNkRZGcJlKY

Rebirth of Nefast - http://www.youtube.com/watch?v=QOFbqlz_Xc4

Both folky:
Waylander
http://www.youtube.com/watch?v=yM5BBHt_RJs
Celtachor
http://www.youtube.com/watch?v=s_ManUE2lMU

Now, this band lives in Ireland currently, but is infact Polish, recommending it only because Popiół is one of the best pagan related things to be ever released. Thy Worshiper:
http://www.youtube.com/watch?v=SMFLXsRfMo0

Can't go wrong with Waylander.

The Waylander song that was linked to begins with uillean pipes exclusively and then switches to primarily traditional black metal with some folky elements. Usually, they're folkier the whole way through the song. Probably my favorite Irish band (I'm pretty sure that they're from Northern Ireland, not the Republic of Ireland, if that has any affect on your level of interest).