Omniknight is a reasonably durable support hero. Not only can he heal his allies and simultaneously damage them with Purify, making him great early on especially with heroes that hold enemies in place such as Axe, but he can also grant magic immunity AND physical damage immunity. With Ags Omniknights ultimate will grant all friendly things (Including buildings) Physical immunity for up to 10 seconds. Currently, Omniknight has the highest win rate of any hero on Dotabuff with 60% making him a fantastic choice