"A ravenous giant coming from the mountains, smashes defensive buildings and other targets in its proximity."
The Cyclops is a new tanking mercenary introduced with the Pumpkin Warriors event. Only one Cyclops can be deployed per battle but it has a very high damage, and also splash damage that damages buildings and mercenaries near it too. The Cyclops doesn't use up Mercenary Barracks space and can be produced in the Blacksmith
The Cyclops is an Event Item which can only be unlocked at the Event Store. You will need to gain Event Points in an Event to be able to unlock the Event Items.