I only remember this one scene and nothing beyond that:
(a bit graphic, click to show)
There are men who are restrained, and their mouths are being held open. An elderly man places a large egg on top of a ramp, and the lower end of the ramp is connected to the mouth of one of the restrained men. The egg eventually hatches, and a big snail emerges from it. The snail then slowly slides down the ramp and enters the mouth of the man, who is forced to swallow it. As a result, the man is immediately brainwashed and gains additional physical powers and will serve as an additional soldier for that old man.
You sure you didn’t just have a fever dream?
The scene in the cartoon you are describing is in “Wizards,” an animated film directed by Ralph Bakshi and released in 1977.
It does not have white haired druid women though.
Heavy Metal has white haired warrior women riding bird things. It has a similar animation style.
EDIT: apparently I fell for gpt’s confident answer, which is incorrect …
The scene you are describing is from the anime series “Naruto.” Specifically, it is from the original Naruto series, not its sequel series, Naruto Shippuden. The scene you described is from Episode 136 of Naruto, titled “Deep Cover! A Super S-Ranked Mission!” This episode features a filler arc known as the “Cursed Warrior Extermination Mission” or the “Kurosuki Family Removal Mission.” The elderly man you mentioned is called Kandachi, and he uses the snail eggs to brainwash individuals and turn them into his servants.
Terrifyingly enough, I’ve never watched Naruto. I just pasted your scene description on chatgpt and asked from which anime cartoon it was.