Tev’s pain tolerance is pretty much a bazillion and he doesn’t really feel much of that, right? If that’s true, how is his tolerance vs the Light? How much before it actually /hurts/? Does Light-induced damage to his body take longer to heal or does it permanently scar?

It’s still pretty high, and compounded with the fact that even if it doesn’t hurt, he’s not going to say that; if it’s a healer, he’s just going to growl at them to stop it. 

It probably doesn’t permanently scar, but the wounds take far more scourge magic to heal than normal.