Celtic Heroes

I've been trying hard to farm shadow strike manuals a I've found was a lesser ss ring and another one any suggestions where I could find the ss manuals?

They don't drop often, and with the amount of rogues, that is what pushes up the price. I got a few on the Hawkhursts behind the waterfall at the lower cistern. The advantage is you can also get chests that sell to vendor for 2k. Good luck.

Thanks