Use the ballistas at Lake Norgan to take down the fimbl during “Reaching the Far Shore”, in the task “Fell the ferocious fimbl at Lake Norgan.” This page covers how to mount and fire them, how to tell a hit, and why they keep breaking.
Quick answer: Hold the left mouse button for a long draw of about 15 seconds with the cross-hair on the fimbl’s body, then release to loose. Short draws did not hit.
Where the ballistas are at Lake Norgan
On Lake Norgan’s western shore, find the ruins of the Deserted Lakeside Estate. Seven ballistas occupy paved circular platforms and terraces overlooking the water. One is positioned atop a wall, and another stands on a higher terrace accessible by stairs.
A ruin in the lake is where the fimbl rests. When you take a seat at a ballista, it lifts from the ruin, calls out a challenge, then stays suspended above the water with its wings spread. Its health display has no name, just three dots on a thin magenta bar.
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Add to Google Preferences →Mounting a ballista (why “F Use” may not show)

Step in one pace closer than looks necessary until “F Use” shows, then hold F to mount.

How to fire and land a bolt on the fimbl

A red flare appears on the fimbl when a bolt connects, and its bar flickers before getting shorter. The flash and reduced bar confirm the shot registered.

Why the ballistas keep breaking
The fimbl’s ice attacks and volleys can wreck a ballista within 5 to 45 seconds of climbing aboard.

Nearby ballistas are wrecked too, even if you’re only standing beside one or walking toward it. A destroyed ballista is unusable, with broken timber left on its platform.

If all the ballistas are destroyed, the fimbl stays suspended high above the lake.
“Stop” (X) only works while you are seated. If you press X after the ballista under you has broken, you draw your weapon instead, and that drawn weapon then hides “F Use” at the next ballista.
After your ballista breaks, make sure you’ve left the seat before pressing a control. Keep your weapon sheathed and go directly to an intact ballista. Don’t linger beside one the fimbl is attacking.
The hailstorm during the fight
A hailstorm may begin partway through. The screen takes on a grey cast as the sky darkens to black, and the notice “Hailstorms” appears with “Tab View Tutorial Logbook”. Your firing technique stays the same: place the cross-hair over the fimbl’s body and hold the bowstring back for a long draw.
When the fimbl falls
When a bolt brings it down, the fimbl drops into the lake and the quest banner reads “Reaching the Far Shore” / “You felled the ferocious fimbl.” The task then changes to “Wait for the change to come over the lake.”






