Nessie is a builder pet awarded for completing The Deeper Well Survival on Easy.
It has no attack, instead it heals like a Fairy but with longer range; however its sole purpose is to increase hero stats, ideally for builders. Its stat bonuses from Deeper Well are always 100 across the board.
In Redux, Nessie is also awarded for completing Dread Dungeon on Survival on any difficulty. From that map, its stat rolls are affected by the difficulty level and Hardcore/Ruthless modifiers.
Notes[]
If you start later than wave 23 of The Deeper Well Survival, you will not get rewarded a Nessie on completion.
Trivia[]
Nessie is a common nickname for the mysterious Loch Ness Monster.