Without hesitation, Willie tries to end the Spider-Goat once and for all. With the aid of the Faerie Fire spell, Willie is able to pull off the most perfect, heroic, bullseye sling shot of his adventuring career! The slingstone hits the beast in the side of the head, killing it instantly from the concussion. To Willie's great satisfaction, the force of the impact breaks the creature's jaw, sending a shower of glowing teeth like sparks into the void below.
Beppo and Dame Simonetta find a perfect goat-crushing rock, that takes two Hobbets to lift, but they see their efforts are unnecessary: All the fight has gone out of the Spider-Goat, and its body dangles limply in its web.
Over the next couple of minutes, the sunny yellow glow from the Faerie Fire spell fades away. The spidergoat corpse and the web are no longer visible, as they are 50' down the crevasse, beyond the 30' range of lantern light.
Nice shot, Willie! What next, hobbetses? Since nobody is wounded, a rest turn is optional.
Lots of good ideas. Who acts first? I rule Willie gets first crack, for two reasons: 1) his plan is simple and direct; 2) of all the party members, Willie has the longest-standing grudge against the Spider Goat.
If Willie fails with his sling, then we'll try Beppo and Dame Simonetta's "drop a big rock" idea and/or Noh and Kiplyn's "burn the webs" (both of which, I think, are good plans).
I kid you not, Willie rolls natural 20! (plus Faerie Fire bonus) He hits for 5hp damage.
Does the creature's body stay in its web, or plummet limply into the darkness below? I'm not sure so let's flip a coin: Heads, it sticks.