Huntera's arena pits in the order the game itself presents them — six on the
capture being served, of a ladder the game's own help text describes as ten
bosses one at a time.

final_boss_name is a name and not a reference. None of the six bosses the
game names is among the creatures this API serves on /v1/creatures, so there
is nothing to link to and nothing here reaches into Tibia's roster for a
name that happens to match: these are Huntera's own bosses.

min_level and entry_gold rise together with display_order across all six
pits, which is what makes the order a ladder rather than a presentation
preference.

?include=ladder adds the ten bosses a pit fields, in the order it fields them,
and ?include=prizes adds its winner's table. Both are absent unless asked for,
and asking costs nothing extra: six pits is under one page, so a client that
wants either gets it in the same single request.

A pit's winner's table is a menu. The game's own help text says clearing all
ten lets you choose one prize from it, so five to seven rows is what is on
offer and not what is handed over. Nothing in the data says that, because the
client publishes no count and no exclusivity; it is said here because it is the
one place it can be said.