really? O.O
yes but Arthas doesn't have much animations... as far as I know only:
1. walk
2. attack 1
3. attack 2
4. spell
5. spell channel
(I don't have we open so I'm not sure are these animations all of them)
object editor > Abilities > (some spell) > Art - Animation Names
for example:
Animation Name for Blizzard is: stand,channel
you can't use specifics in the data field. it will only random between the 2 attacks.
the custom script is the best way to use very specific animations.