about the changes you want to do:
egypt:
slave die animation , hm I don't think its sooo bad, but go for it if you can make better ones
ibis fly animation: yes I bet it can be improved.
spearthrower dying yes, the spear flies a bit strange
you can do it.
Persian:
Magician walking: yes go for it
norsemen:
you don't like the way the axeman walks ? strange, I especially liked the animation
What's wrong with the spearmens walking animation ? for me it looks great,
( but for all: if youthink you can do better ones, do it and show us somehow before ? )
About willvarfars idea:
About the particle effect when dying: this can be indeed a very good option that some of those units are gods or made by gods: To explain it to tiger:
In old Egypt Ibis/Snake/Scarab were gods. The idea was to show theri godlike power with splash attacks for example
. And Anubis was god too but as he only fights "conventionel" with a sword its a really good idea to let him die with something magic ( like a particle effect.
So yes I like tthe idea.
update: what about a 1 to 3 particle effect showing images of an anubis flying into the air getting more and more transparent like smoke?