Thunder Fists

An extremely powerful wonder weapon, the Thunder Fists are given to the player after filling 4 chests with souls in Origins. They are a one-hit-kill until round 19, and upon impact, send each zombie flying back, much like the effect of the Thunder Gun. They can be upgraded into the Iron Fists, and are central to the Easter egg Samantha is trapped.

How to Obtain
To obtain the Thunder Fists, the player must kill zombies near the 4 chests in the map. One is in the footstep by generator 4, one is one the footstep leading from generator 4 to Excavation, one is in the footstep near generator 5, and one is in the footstep near the church. If the chest goes too long without absorbing souls, or if it stepped on by the Giant, it closes and the player's progress is lost. The best method is to form a train of zombies and then bring them back to the chest for slaughter.

Upgrading to Iron Fists
To upgrade the Thunder Fists, one must kill 20 Templar zombies in the lower excavation area, near the staff crafting area. Note that normal zombie kills do not count; one must kill 20 Templars with glowing hands. After the task is done, a power-up will appear for the player. The Iron Fists are very similar to the Thunder Fists; however, they do much more damage, and will take on the elemental powers of any staff equipped.