Natives of the plane of shadows, the shade elementals embody darkness and death...
Shade Elementals are summoned by Umbra in packs of six and are used by Umbra to reduce your lives since Umbra itself does not move towards the exits. At first, due to their lack of HP, Shade Elementals are relatively easy to beat, but after Umbra reforms for a few times and destroys several of your towers, it summons an increasingly large number of these enemies, quickly turn them from weak cannon fodder to a deadly threat. In addition, the Shade Elementals' very poor bounty (5) also makes it difficult, though not impossible, to rebuild towers destroyed by Umbra.
Do not be fooled by their appearance, these beings deal abnormally high damage, enough to wreck Footmen and Knights alike, so your best bet to hold them back is using Assassins to dodge the deadly blows. Knights Templar work nearly as well, but cannot kill as effective and thus risk being overrun by many Shade Elementals. Skeletons, being numerous, can stop Shade Elementals for a while, but since the Necromancer cannot raise skeletons from these enemies, his skeleton reserve will inevitably run out. Keep spamming Reinforcements, since they cannot do much against Umbra, they should be used to their fullest extent to slow down its minions.
AOE/multi-target attacks are almost vital to defeating Shade Elementals; Pestilence is a good choice, so is Rain of Fire, Critical Mass and Barrage, and potentially Unstable Disease if Bonehart is available. Purchase these earlier in the stage, you would not want them to eat into your gold reserve for rebuilding towers.
You should also take a look at how to defeat Umbra, if you haven't already.
|Kingdom Rush - Enemies|
|Goblin • Orc • Shaman • Ogre • Gargoyle • Shadow Archer • Dark Knight • Wulf • Worg • Golem Head • Goblin Zapper • Orc Champion • Worg Rider • Forest Troll • Hobgoblin Chief|
|Bandit • Brigand • Marauder • Giant Spider • Spider Matriarch • Spider Hatchling • Raider • Pillager|
|Troll • Troll Champion • Troll Chieftain • Yeti • Rocket Rider • Dark Slayer • Son of Sarelgaz • Troll Pathfinder • Troll Breaker|
|Demon Spawn • Demon Lord • Demon Hound • Demon Imp • Skeleton • Skeleton Knight • Necromancer • Magma Elemental • Husk • Noxious Creeper • Mutated Hatchling • Tainted Treant • Swamp Thing • Rotshroom|
|Zombie • Giant Rat • Wererat • Fallen Knight • Spectral Knight • Abomination • Werewolf • Lycan • Black Hag • Sheep|
|Demon Legion • Flareon • Gulaemon • Cerberus|
|The Juggernaut • J.T. • Vez'nan • Sarelgaz • Gul'Thak • Greenmuck • The Kingpin • Ulguk-Hai • Moloch • Myconid • Lord Blackburn|
|Kingdom Rush: Origins - Enemies|
|Gnoll Reaver • Gnoll Burner • Gnoll Gnawer • Hyena • Perython • Gnoll Blighter • Ettin • Twilight Harasser • Gnoll Catapult • Gnoll Warleader • Twilight Brute • Blood Gnoll • Blood Ogre • Ogre Magi|
|Sword Spider • Satyr Cutthroat • Satyr Hoplite • Webspitter Spider • Gloomy • Twilight Scourger • Scourger Banshee • Bandersnatch • Redcap • Twilight Avenger • Boomshroom • Munchshroom • Fungus Breeder • Zealot • Bunny • Blood Servant • Screecher Bat • Mounted Avenger|
|Razorboar • Twilight Evoker • Twilight Golem • Cloud Stalker • Spiderbrood • Twilight Heretic • Son of Mactans • Arachnomancer • Drider|
|Shadowspawn • Devourer • Dark Spitter • Shadow Champion|
|Hi-Hi Enha • Malicia • Spider Goddess • Bram the Beheader • Baj'Nimen the Hateful • Godieth|