He seems to be nothing short of a great model. A lot of attacks, high WS and Init, the Spear of Twilight, and the Eye of Wrath, all at a really reasonable point cost. My main concern is... Where do I put him where he'll be the most useful? I usually like to walk him along with a unit of Wraithguard to give him a nice beefy shield unit, then detach, run, assault when appropriate (popping Eye of Wrath as needed).
What do you think of Yriel and how do you use him, if at all?