Japanese Death Poems are not so "scarry" as the name suggests... actually, those poems are the expression of a centuries-old tradition of writing jisei, or the "death poem." Such a poem is written generally in the very last moments of the poet's life.

Most of those poems, if not all, are indeed precious, limpid jewels and stand for the poet's awareness:

Winter ice
melts into clear water —
clear is my heart.

Hyakka