Mouryou Senki Madara

Retro high fantasy, medieval fantasy and DnD lookalikes. Isekai included. No hentai included.
For more retro high fantasy including stuff made in the 2000s, check this chart:
https://www.edison23.net/dir/ar/img/fantasy.jpg

Part 2: https://myanimelist.net/stacks/32825

Enjoy:

https://www.youtube.com/watch?v=awgehIvCXs8

Anime with mecha that's less sci-fi (or not at all) and more fantasy-based where the mechs are more like mechanical or magical giant suits of armour and feudal knight-like. Anime likes to blend sci-fi and fantasy together so some of these are going to be kinda' specious, especially towards the end. For series I will only link the first or base anime rather than listing all the sequels.

These are just some which I've seen and plan to watch. Includes movies and OVAs.
This list might keep getting updated.

Part 2 here : https://myanimelist.net/stacks/37380

Fantasy works set in medieval or archaic settings.

Some of these are questionable, like Suisei no Gargantia can be argued to be fully sci-fi, but there is a feel to it that makes me include it, along with organic and archaic elements that are woven together in a way that makes this appear more fantastical than your average sci-fi. Similarly, Gankutsuou is sci-fi with advanced technology, but it's futuristic imagery is conceptualized to cohere with the elegant 19th century setting of Dumas' novel. I'm also avoiding the inclusion of more than one entry per series, so if season 1 is on here, then season 2 likely fits just as much.