Actually scratch that: I'm listening to Poul Anderson's The Broken Sword and the protagonist Skafloc is definitely a multiclass Fighter/Magic User. So that's two.
And when we do he'll either be on the weaker side magic wise or else marked by the powers he wields in some other noticeable way. Classic example is Pelias in The Scarlet Citadel scaring away Satha the Ur-Serpent just by the latter getting a look at his sorcerer's soul. About the only "hale and...
I'd recommend looking at the Heroic Fantasy Handbook for ACKS (Adventurer Conqueror King System). Eldritch, ceremonial magic that takes time to use and blackens the soul in the process, among other tweaks to the standard D&D experience.
Available in SRD form right here for the curious...
Given the spell lasts for eight hours I could totally see someone using it to perk themselves up only to forget it's still working during the post adventure wenching session. Whoops...
Odd nitpick: is there a reason the Fertility Charm spell doesn't give the 5e equivalent of the Endurance Feat like the PF version did? The idea of adventurers having stuff like this cast on them for reasons completely unrelated to the intended purpose just tickles my fancy. 😁
Also, I would like to request that Crom spare you any and all Dooms he may have had in store for you in recognition of the fact that new Xoth stuff is on the way.
To be frank, I'd say most 5e classes would need some tweaking to make them really fit a pure sword and sorcery setting as opposed to the more traditional high fantasy D&D world. But then again I'll be translating any future Xoth publications to Barbarians of Lemuria so it's not that important to...