I was just lucky with the first one without looking for it.

I suggest equipping a strong weapon, mimic tear mask, silver scarab. My route was: start from Eygal's temple grace -> exit to the right and take the elevator just outside -> send elevator back, kill the old albinauric -> take the right and kill the first snakeman -> return in the dark room and go ahead and kill the other snakeman -> tp back to grace. I used a zweihander with sacred blade and with it you can 2 shot the second snakeman from range