Bobble Head

Bobble Head
Base Health:	3,000
Speed:	Slow
Armor:	0 (weakspot) Infinite (non-weakspot)

Overview

The Bobble Head has rather low health, but it is invulnerable to damage from all directions except for the obvious red weakspot. It ignores players completely and will only attack the core, which it does by smashing its "head" into the core repeatedly.
When it attacks the core, it deals 75 damage per hit.
Among the towers, the Bobble Head is only vulnerable to the Drone tower & Rupture Mines as these ignore armor. All other towers in the game are incapable of damaging it. The environmental yellow plant & orange mines also don't deal any damage to this enemy.

Bobble heads appear in 19 game maps:

The Kairos and the Slow Field Dispenser are able to slow its "bobbing" movements, making it a much easier target.
The Mind control spire can immobilize it for a stun time, in which time hitting its head is easy. Makeshift cannons also can stun this lume, although they don't deal damage to it.
The Drone is the conventional anti-Bobble Head tower, that can deal high damage to Bobble Heads or even kill them if applied properly.
Rupture mines also can do great job vs Bobble Heads, but when the mines are attached, it is good to not slow or stun the Bobble Head to ensure the mine is dealing as much damage as possible since the damage depends on the distance walked. If the lume walks in a straight line without twists after the mine is attached, it would take some more damage than if there are many twists.

Most weapons are effective at hitting its weakspot. Only weapons that don't rely as much on accuracy, such as the REX and the Grenade launcher, have trouble with this enemy.
It is recommended that players kill the Bobble Head before it reach the towers or else they can end up wasting time shooting it.
The Sniper Rifle or a mid-charged bolt from the Ballista are especially effective, as it is able to kill a Bobble Head in one shot if the player is not playing with other people (a larger amount of players results in increased enemy health). The Drone Launcher is also capable against Bobble Heads as it ignores their infinite armor, regardless of aiming.
The Bobble Head attacks the core with its "head," and does so by waving it around haphazardly. This makes it more difficult to be killed, as it becomes harder to aim accurately at the small weakspot, although for a short period of time it will be like "gaining strength" before doing the hits. As such, it is recommended to prioritize killing the Bobble Head above most other enemies before it reaches the core.