The Fiskeplaske is a large, slow, flying boss found on the final wave of Laser Bridge.
Completely immune to damage from all non-weakspot hits. Weak spot moves between 4 locations, switching when damage is dealt to it.
Towers have almost no effect on the Fiskeplaske, other than occasional lucky hits. Kairos towers will slow it down, but only minimally as they are applying a percentage based slow to an already slow moving target.
Stand to the front to see 3 of the 4 weak spots. Little damage is needed to cause it to change, so hard-hitting weapons like the Sniper and Ballista work well. The rear weak spot provides the biggest challenge as you'll have to avoid being killed by the other Lumes in the wave.