Responses
Try this one:
http://www.mangago.me/read-manga/tensei_shitara_slime_datta_ken/
You'll probably find related mangas on the tags and lists found on the right side of the manga pages. 'Isekai' or 'different world' tags mostly have same kind of plot developments as that of your examples.
any fantasy mangas that have world building like these:
http://www.mangago.me/read-manga/tondemo_skill_de_isekai_hourou_meshi/
http://www.mangago.me/read-manga/tales_of_demons_and_gods/
http://www.mangago.me/read-manga/dungeon_seeker/