When I was really young I remember watching a anime that we got from the video shop back before dvd's.

All I can remember in this anime:

At the beginning this guy grabs a soldier in plate saying "This knife will cut through your armor like butter"

The ending is a girl walking on a field of gold (from a prophecy) but the field of gold is created by all these creatures with tentacles

Nausicaa of the valley of the wind