Changelings are creatures from the second series of MLP: Frendship is Magic. As in the show, they can take the form of other ponies, disguising themselves as the Mane 6 in this case. Once revealed, they are similar to parasprites, being obstacles that need to be cleared by using the appropriate type of Element Shard. Unlike parasprites, one changeling will take up 5 elemental shards to defeat. Each one stands in the center of a little crater which acts as an impediment to building, which will only disappear after the changeling has been defeated.
Note: On some devices the crater will not be properly removed after the changeling's defeat, or the changeling will just stand there without the aura. It should be gone on your next visit to Canterlot, however.
Note: Changelings can sometimes land on the bottom borders of the terrain, which can make it difficult to tap them. Zooming in might help.
Uncovering Changelings Edit
You can find changelings in two ways. First, they can appear when you expand shadowed zones like parasprites. However, instead of spawning on clear zones like parasprites do, they show up in disguise as any member of the Mane 6. If you go to Canterlot you may see half a dozen Mane 6 ponies running around. Only one of each of them is the real one. Simply tap on each one, and if they respond they are real, if they are a clone, they will jump and disappear in a column of coloured light to land somewhere in your clear zones as a changeling, creating its crater.
Secondly, when you buy an expansion a new changeling will very likely appear in the zone you just uncovered, similiar to how parasprites in Ponyville do. One difference between changelings and parasprites is that they aren't limited to spawning on cleared zones. The clone copies will happily wander around in both cleared and uncleared areas and will even interact with other ponies like normal. When you uncover them they will only land in cleared areas, but they can land on top of places where you have buildings and pavement.
Clearing Changelings Edit
To clear changelings tap on them 5 times. They have a 'health bar' with 5 lines, representing the 5 shards needed to defeat them. Each time you tap on them, you use a shard to lower their health.
When clearing changelings, you can obtain bits as a reward on the removal of each bar. There is also a small chance that a single gem may pop out when you defeat it.
As a part of the quest series in Canterlot there are several quests that will require you to uncover and/or defeat changelings.
In addition near to the end of the questline, you wil have to defeat Queen Chrysalis by clearing 6 waves of changelings, each consisting of 8 changelings of the same type. Each wave must be cleared completely before the next one spawns.
However, unlike in the series, defeating her will not stop changelings from spawning. Just like parasprites, changelings will continue to spawn in their various forms.
Types of Changelings Edit
There are 6 types of changelings, matching each of the Elements of Harmony. They can be distinguished by the colors surrounding the rim of the crater.