Arctic Wind

Arctic Wind is the final upgrade for the Ice Tower in BTD4 and the third upgrade of the first path for the Ice Tower in BTD5. With this upgrade, bloons slow to about one third of their original speed due to the cold of Arctic Wind. Arctic Wind does not slow down MOAB's, BFB's or ZOMG's but will slow Ceramic Bloons. Dragon's Breath/Glaive Lord and this form a deadly combination. In BTD4, It costs 5100 on Easy, 6000 on Medium and 6480 on Hard. In BTD5, it costs 5525 on easy, 6500 on medium, and 7020 on hard.

Strategies
One of the good ways to use this tower is to use it against mobs of bloons. Even the bloons that can't be frozen will be slowed down to let the other towers do their work. So the Arctic Wind should be placed at the beginning of the tracks. In the late levels, even Arctic Wind can have a high pop count. However, you should upgrade this to Viral Frost as soon as possible due to the high increase in power.

Trivia

 * Even through the Arctic Wind slows Camo Bloons in Bloons TD 4, it can't attack them. (Unless there is a Sonar Beacon up in the area).
 * Arctic Wind can slow down White Bloons and Zebra Bloons, but not MOAB-Class Bloons or Camo Bloons (even with Camo detection in Bloons TD 5)
 * The slow aura can slow down bloons being thrown back by a tornado.
 * If you use a Monkey Village with Radar Scanner or a Meerkat Spy, it can freeze camo Bloons, but not slow them.
 * In Bloons TD 5, an Arctic Wind combined with a Tier 3 Ice Fortress and Jungle Drums will pop Ceramic Bloons right where they were first frozen.