from the website blurb:
Adventures in Mythic Europe is a campaign guide for playing the N/A game in the Ars Magica Fifth Edition setting of Mythic Europe.
from the Overview:
This campaign guide assumes that the Dungeon Master has familiarity with D&D 5e and Ars Magica Fifth Edition. In fact, you will need these books:
Dungeons & Dragons 5e Player’s Handbook (PHB)
Dungeons & Dragons 5e Dungeon Master’s Guide (DMG)
Dungeons & Dragons 5e Monster Manual (MM)
Dungeons & Dragons 5e Xanathar’s Guide to Everything (XGtE)
Ars Magica Fifth Edition Core Rulebook (ArM)
and as many other Ars Magica game books as you desire. They’re excellent.