“Tier 3 Troops They are Healers, Dragons, and P.E.K.K.As. These troops are a valuable part of a very strong and powerful non-hero troop in the game. They have the ability to destroy the whole village using a few troops and therefore overwhelm defenses easily. The challenge is that they are extremely expensive and they will cost you a lot of elixir as well as take too long to train. They are however not vulnerable to mortars and wizards Towers and therefore used often. Their snapshots appears below Healer Dragon P.E.K.K.A””
Clash of Clans Game Guide - Tips, Tricks and Strategies