I know a few people have mentioned this already but some specifics:
Has a giant staff as a melee weapon but it has a pillar of light/dark orb on top which can be upgraded to shoot a beam out as a direct damage magic ability.
Raises Mummys as a unit specific minion
Has an ability called Ageing which reduces speed/health/armour/attack speed by 10/15/20% as it upgrades, and the effect lasts 20 seconds except the health loss which is permanent ( until regen of course or healing)
Has a passive/permanent armour upgrade ability called enhanced enbalming(mummification process) which increases the Annubis's armour by 300/600/900/1200
