Are there any ways to augment (created or existing) undead?

[Nekomimi^w^]

Extra stats, extra feats, extra capabilities... anything? ^^

Only one I know of is Charnel Soldiers.

[Merm7th]

Had a Occultist focused on necromancy who would travel with a portable altar strapped to his back. He would cast desecrate and his undead would gain +2 attack and +2 hp/hd. Attached it to the back of his undead mount when adventuring in areas large enough. He eventually had a permanent desecrate on the alter. He later had it shrunk and set in a ring he wore.

[Volkard Abendroth]

Undead created inside the AoE of a Desecrate spell receive bonus HP.

[Isaac Zephyr]

Make them into a Necrocraft? In my searching I really haven't found much which hasn't already been said above.

[Azothath]

Nekomimi^w^ wrote:

Extra stats, extra feats, extra capabilities... anything? ^^ ...

yes