The Wikipedia article on helium hydride has the most hardcore sentence I've ever seen on the site: "Since HeH+ reacts with every substance, it cannot be stored in any container." It sounds like something out of a comic book.
> In fact, HeH+ is the strongest known acid, with a proton affinity of 177.8 kJ/mol, or a pKa of −63
Long time I didn't do chemistry but that pKa made me jump off of my chair.
For comparison hydrochloric acid is ~10.
Since it's a charged molecule one could maybe contain it in an EM field to have some ready-to-use "eat anything" material.
Almost - but not quite - as scary as FOOF:
> Dioxygen difluoride reacts vigorously with nearly every chemical it encounters (including ordinary ice) leading to its onomatopoeic nickname FOOF (a play on its chemical structure and its explosive tendencies)
"vigorously" being quite an understatement.