Omg Booyah... you wasted points on a skill you may only use 5 time in any given day.
Yeah well *caugh* I did some stupid things with my free stats... least we got stat reset scrolls. I was not going to bring up Invincibility... but going 5 points into it make Invincibility last nearly 17 sec. My general reaction from tanks is "Omg your invincibility is strong". Even if you solo it is well worth the 5 points... it will give you enough time to drop 2 monsters off your back.