Well hey I mean:
A massive creature of living stone, Malphite struggles to impose blessed order on a chaotic world. Birthed as a servitor-shard to an otherworldly obelisk known as the Monolith, he used his tremendous elemental strength to maintain and protect his progenitor, but ultimately failed. The only survivor of the destruction that followed, Malphite now endures Runeterra's soft folk and their fluid temperaments, while struggling to find a new role worthy of the last of his kind.
And this:
https://am-a.akamaihd.net/image?f=https%3A%2F%2Funiverse-meeps.leagueoflegends.com%2Fv1%2Fassets%2Fimages%2Fmttargon-once-in-a-lifetime.jpg&resize=:1200
Doesn't exactly not look like an obelisk.
So hey, crackpot theory time!
Mount Targon wasn't actually a mountain on Runeterra, but an otherworldly object created by Targon and embedded in Runeterra with the intent of having natural defenders pre-installed on the planet. They designed the Monolith to have a bunch of servitor-shards to defend it, but during a great conflict (The Great Void War maybe? I mean it's the Void and a war why wouldn't Targon get involved?), the Monolith was broken, Malphite's kin killed, and Targon instead did some magicy shit to a tall mountain since they couldn't just shove a new monolith in to Runeterra without freaking out all the humans. Thus Mount Targon was made and Targon decided to rely on the mortals of Runeterra as its defenders, providing them with extra help when necessary via coming down themselves and possessing some sod.
Alternatively Mount Targon IS the Monolith, just broken, or created from its remains.
Alternatively none of this is actually right.
