Quote Originally Posted by Zero-ELEC View Post
As strong as the plot demands them to be or as strong as will make for an interesting story.

If you want "feats", there's no clear answer as almost every big thing that the WoL faces is done so with the help of the Scions, Adventurer buddies, or some other manner of boost (empowered by the eye of Hraesvelgr when fighting Nidhogg; suffused with the Light of all the lightwardens when facing Hades, only able to control it thanks to the rejoining of Ardbert and the WoL; pushed forward by the prayers and hopes of the Scions on the edge of existence; etc.).

The biggest, baddest, thing that the WoL has faced and defeated on their own is, well, Zenos and Shinryu, and even then it's unclear if the WoL was alone when fighting Shinryu. Certainly they were when fighting Zenos at the edge of existence but how much they were empowered at that point with the wishes of the Scions that they return is unclear (after all the edge of existence is more of a metaphor than a tangible place). And even in that situation they nearly died.

In the end, looking at things in a "feats" perspective is reductive, since it dismisses the realities of combat. The WoL, in the end, is still just a person, if you poison them or stab them, they'll crumple like any other, if they get distracted while engaged in combat, they'll take blows like any other. They're just unique in that their soul is more dense and have access to the Echo (and the Blessing of Light besides), and well in that they help people out which makes them liked and then they help out.

People can and will match them martially or mystically.
This is one of the better answers I've gotten! A few things, though.

I think there are a few feats that can be pointed to, such as when we fought Eden Prime. Eden created an alternate reality exactly like Sephiroth's Supernova (which is confirmed to be an alternate reality, not just an illusion. I'm new to the forums and can't figure out how to post scans, otherwise I'd back up this claim), blasted the WoL through the vacuum of space into a galaxy which then exploded in their face... and they were fine. I don't recall them surviving this under any sort of outside help, either. There are a plethora of other examples, but that one immediately comes to mind. And of course, the WoL has become much stronger since then, evidenced when they 1v1'ed Zenos who was empowered by enough of the mother crystal to assume his Shinryu form along with all of its abilities, and I don't think the hopes and prayers of the Scions were empowering the WoL at this point either. With this in mind, I doubt that something as simple as stabbing the WoL is going to stop them.