This is an ancient poem, written in old pony, and clearly also a prophecy. It was originally written with large letters, and looks like coal on parchment. It was probably never intended to last more than 100 years, let alone over a millennia.
The symbol [...] indicates unreadable text. This poem appeared to include two stanzas, but the entire first stanza has been reduced to a single smudge. This is the second stanza, now barely readable.
[...]
[...]
Hish will fine the mar
[...] hi the ar [...]
Brightly Son to yeild te day
In all thish yo will zee
Mun agloo te soft of nigt
with bot mar[k?]s yo will be
Com nu ner [...]
[...] hish tom me [...]
[...]
Fitch her sooner [...]
[... ...] shii[l?]a
[...] famtum [...]
[...] stiil bar [...]
[...] dappont onz