Early on in the campaign, we were lost in a shadowland and rescued by a renegade Abyssal. He ended up more or less being Liam's BFF, so Liam made it his life goal to help renegade Abyssals.
Unfortunately, between wearing soulsteel and becoming convinced that all Deathknights would be good if you could just evangelize them enough, he went a little crazy. When he died, he actually did get called to become an Abyssal -- but our party's Zenith saw it coming and put an end to that. XD