BUG: Flame Enchantment cast on a creature with a health boosting artifact doesn’t work. Proficient appears as a buff, but they don’t actually gain any max health.
Proficient as a buff cast mid-combat plus health boosting artifact doesn’t work. As far as I can tell that’s it. Although in this specific example the creature holding the artifact was my kolossfirebrand plaguedoctor and someone else cast the buff flame enchantment onto him with the spell that does that.