"Flickers are lesser elementals from the various elemental planes that have crossed over into our world. Their magical bond is tenuous at best and they are known for "flicking" back and forth between their plane and ours. They are the starting point for Ars magica automation. Flickers are timid by nature and will flick back to their own dimension if attacked, or if they feel threatened. Giving them a modicum of magic in the form of some sort of lasting effect makes them more comfortable and less likely to run away. Flickers can be captured inside of a flicker jar. There is one type of flicker for each affinity, flickers of each affinity will behave differently. For example, air flickers tend to like to stay higher above the ground, while earth flickers will prefer to stay low. Flickers of each affinity can be found near regions of the world that remind them of their affinity."
Water flickers
appear as dark blue little endermen like entities with black eyes and a darker blue band along their head which is leveled with their eyes, they also appear to have miniature horns which are also blue. They tend to stick to the water or the ground.
Spawn location
Water flickers will be found in areas that are predominately water, like swamps, rivers and oceans.
Air flickers
appear as gray little endermen like entities with black eyes and a darker gray bands along their heads which is leveled with their eyes, they also appear to have miniature horns which are also gray. They tend to stick to the air or the skies.
Spawn location
Air flickers can be found anywhere not underground (the surface and above) and will fly around higher in the sky (around 25 blocks above the ground).
Earth flickers
appear as brown little endermen like entities with black eyes and a darker brown band along their head which is leveled with their eyes, they also appear to have miniature horns which are also brown. They tend to stick to the ground or just above water.
Spawn location
Earth flickers can be found anywhere, but they prefer underground locations. They will stay close to the ground.
Fire flickers
appear as dark red little endermen like entities with black eyes and a darker red band along their head which is leveled with their eyes, they also appear to have miniature horns which are also red. They tend to stick to the air and don't care about lava or fire.
Spawn location
Fire flickers can be only found in the nether.
Lightning flickers
appear as yellow little endermen like entities with black eyes and a darker yellow band along their head which is leveled with their eyes, they also appear to have miniature horns which are also yellow. They tend to stick to the air or the sky.
Spawn location
Lightning flickers can be found on beaches and over oceans in the sky, where storms like to form. They can be found in all areas if it is storming.
Nature flickers
appear as dark green little endermen like entities with black eyes and darker green bands along their head which is leveled with their eyes, they also appear to have miniature horns which are also dark green. They tend to stick to the air.
Spawn location
Nature flickers can be found in forests.
Ice flickers
appear as white little endermen like entities with black eyes and light gray bands along their head which is leveled with their eyes, they also appear to have miniature horns which are also white. They tend to stick to the air or the skies.
Spawn location
Ice flickers can be found in frozen areas, such as taigas.
Arcane flickers
appear as purple little endermen like entities with black eyes and purple bands along their head which is leveled with their eyes, they also appear to have miniature horns which are also purple. They tend to stick to the air or the skies.
Spawn location
Arcane flickers can be found in magical areas. They very much like witch wood forests.
Life flickers
appear as light green little endermen like entities with black eyes and darker green bands along their head which is leveled with their eyes, they also appear to have miniature horns which are also green. Both tend to stick to the air.
Spawn location
Life flickers can be found anywhere. Any flicker spawning has a small chance to be a life flicker rather than whatever else it could be. This means they can spawn anywhere, even in the nether.
Ender flicker
appear as dark purple little endermen like entities with black eyes and dark purple bands along their head which is leveled with their eyes, they also appear to have miniature horns which are also dark purple. They tend to stick to the air or the skies.
Spawn location
Ender flickers are found in the end. Occasionally, a teleporting enderman can open a rift large enough for ender flickers to slip through. This means, ender flicker farms can easily be created by endermen teleporting.
Uses
All types of flickers can be used for their respective flicker foci.
Pictures
Trivia
Flickers only appear when a lure is placed nearby.(citation needed)
There's a flicker called 'XyCraft flicker' which doesn't spawn but according to the arcane compendium they are implemented, they do nothing as well.
All flickers spawn eggs, are from the same egg
All flickers use the same texture, but are recolored respectively.
Flickers aren't effected by black arums.