Oppertunity attack from sentinel
So what happened is an enemy monster used a melee attack on me and rolled a nat1 missing me and hitting its ally
I have sentinel,since the text says attack on any creature other than me does this induce an oppertunity attack
Edit: reading all the replies , this particular scenario would only happen with homebrew hence its upto the DM if they allow it or not .
Thank you all for the clarifications