The Party, particularly
Jules, murdered two hobgoblins lovers named Bill & Steve the first time this tunnel had to be traversed. The rest of the hobgoblins, being lawful neutral, were then paid off to allow for safe passage. Note for future reference that there's a statue down there (unseen by players as of yet) and some of the hobgoblins have Eldritch Blast, which implies some
Warlock activity. One of them was named “Rex”.