Pretty simple. A cheap item (a la detection ward or whatever it's called for 50 gold) that is a one-use, creates a mirror image of your Demigod that you can use to distract enemies, scout, whatever. The mirror image would do no damage, and take twice as much damage (so it's obvious in battle that it's not real if you pay any attention at all).
There could be another item, much more expensive (and with additional stats like mana, hp, weapon dmg or whatever), that allows you to make unlimited copies (with a 20-30 second cooldown or something of course).
