Can larkin also "eat" other forms of Investiture?

[Cyanic]

We've seen it 'eat' stormlight and voidlight, would it also be able to 'eat' Breath? Or Dor energies?

[Calderis]

Yes. They feed on investiture. They don't care what kind. 

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zas678

What would a larkin do on Scadrial around a metal?

Brandon Sanderson

A larkin on Sca-- It would have to-- *pause* I'm going to RAFO that. I mean I know what it would do, but let's let you see what larkins can do more.

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Questioner

If you were a Leecher, could you destroy a Shardblade?

Brandon Sanderson

I'm going to RAFO that for now, let's just say that it would be incredibly difficult if it were possible, and I'm not going to even say if it is. But that kind of power... 

Questioner

Let's just say they were burning duralumin as well.

Brandon Sanderson

Let's just say that the Investiture in a Shardblade is much greater than your average Allomancer, but... This type of thing is not unheard of in the Cosmere. The larkin, the Leechers, and Nightblood all have a similar sort of thing going on. Destroying a Shardblade would be really hard. And Investiture resists other forms of Investiture, so.

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Nightblood doesn't care what kind of investiture he feeds on, and leecher can burn away investiture other than what comes from Allomancy. Pretty sure that's true of Larkin as well. Investiture is Investiture.