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(魔境外伝レ・ディウス, Makyo Gaiden Le Deus)
A great treasure awaits you! Imagine this, a power source from an ancient civilization that can also act like an elixir which can grant life
Another SF 80's OAV I haven't watched until now! Designed by Rei Aran (same dude who did Iczer) this was much more lighthearted and harmless.
In short, it has a very RPG environment and storyline, but very 80's SF character and mechanical designs. It's a very stereotypical protag-needs-to-find-ancient-relic-to-save-kin-with-cute-girl-sidekick kinda story, but it uses this effectively by not losing time on 'tropes you should already know' and instead focuses on comedy, environment, and effects animation (it's only 47 minutes long).
Overall, a neat little OAV and I strongly suspect there is more behind it and I'm just not finding the info (a game tie in??? A longer manga than the few pages I am finding???)