Grank the Rat
Grank the Rat was an in-game secret on the Warcraft III: The Frozen Throne night elf campaign chapter 4, Wrath of the Betrayer. He was on the top where Maiev had to blink past a Naga base, in a garden behind that very base.
He couldn't be killed by normal means, having a supernatural ability to dodge any type of attack. The only way to kill him was by using the secret critter killing procedure: repeatedly clicking on him. After dying he dropped a Talisman of Evasion.
- Grank and Filson were named after Blizzard associate producer Frank Gilson.