I didnt even think about ICC/shadowmourne and invincible.
The same kill where i got my Crimson Deathcharger, Invincible dropped.
Had i not been running with friends (and had friends that helped me complete the blood infusion) I’d have invincible right now.
But it didnt feel right taking both the deathcharger and invincible, so i let my friends roll on it.
I’ve never seen Invincible drop again