There's no dominating, no managing your army, no sending them on missions, no custom sieges or defenses. The Light really is no substitute for the Nemesis system, which is all but absent in The Blade of Galadriel. Swapping the Light cone to a Light radius or adding target-chaining to Light projectiles doesn't change it up very much. That does let you pull off some flashy mass-killings – I like to jump into the midst of a group, set off a Light bomb attack, and then hurl Light blasts at all of them to eliminate the entire group in seconds – but it’s fairly simple and repetitive once you've done it a few times.
Build up enough of it on a single target and they'll be stunned, and hitting them with another blast evaporates them into glowing mist. Her main distinguishing feature is that, instead of dominating uruks (which she refuses to do on principle), she can blast enemies with what is effectively a damage-hose: the Light of Galadriel. “Though Eltariel mirrors most of Talion's abilities from the outset, she has only a handful of upgradable powers to work with, so progression is limited.