[Jack_Trowell]

Don't think of seduction as a way to capture units, but as a better assassination ability.

With it, your Rhakshasis are de facto assassin mages that can, with the correct spells/items, kill most commanders.
I once used one that to capture a indep province near my capitol while my main army was elsewhere (indeps str 9) : it took 3-4 turns to kill all the commanders, and one more to capture the province, it was a lone commander, and not an army.

And of course sometimes you get lucky and get a free commander. Usually just a normal commander (always useful for carrying troops to the front), but sometimes you can be very lucky and get a mage with useful magic paths or a good ability.