Thunder Spear

Eren call it the iron spear. Hange calls it the thunder spear. It's a new technology specifically developped to fight against armored titan.

Usage
It is a weapon which enable humans to fight against armored titans. But it's a dangerous and tricky weapon to use.

Origin
It is based on the technology developped by the Central police force against the Survey Corp. This technology was reused and applied to design a new special weapon against armored titans.

History
The intention is to kill Reiner and Bertold.

It is explained, demonstrated, and used against Reiner in chapter 76. It was capable to blind Reiner, to open up his armor shell, and might well kill him in chapter 77. For Bertold, more to come in the incoming chapters.

Mechanics
Same as the central police gun, but with a strong spear, loaded which explosive.

Training
There was not much time to train. But Hange did carefully place her troops so that they would be in optimal position to attack

Limitation
Because of the danger it pose, it should only be possible to use it when the titan is surrounded by enough tall objet or buildings (like in a town or a forest).

Trivia
Reiner does not have the same reflex as Annie. He seems dumbfounded when confronted to the new technology. His armor may have given him a false impression of safety