Here are my 5e conversion notes for a Mystara 5e campaign.
Race Conversions
Mystara is home to a lot of races. The following are links to subpages with races often found in the Known World and it's surroundings in my campaign.
Dragonborn
Dwarves
Elves
Genasi
Half-Elves
Halflings
Human
Orcs
Rakasta
Tiefling
Tortle