For Jeanne d’Arc, the “Strength of Heaven” ability from Level 4 JD gives +300 health, +4 melee/ranged armor, and +300% damage.
However, the unit only receives +200% damage (x3 damage), instead of +300% damage (x4 damage).
Either the description (+300%) is wrong, or the +200% actual effect is wrong.
Build: 12.0.1974.0