the.com/styx
the river you cross once, one-way, no refunds and no return ferry.
means in greek myth, the river separating earth from the underworld, whose water gods swore unbreakable oaths on.
from from greek stygein, to hate or shudder, styx was both a river and a goddess, daughter of oceanus and tethys, who backed zeus in the titan war and got eternal cosmic honor as the oath of the gods for it.
oath bindinggods swearing on styx could not lie
achilles connectionhis mother dipped him in it
heel exceptionthe hand holding him stayed dry
ferryman feecharon required a coin for passage