Slow Field Dispenser

=Description=
 * Slow Field Dispenser is an unique assistive tower. It provides fixed amount of clusters that can be picked anytime and placed anywhere in the map. Once placed, a cluster generates a field that slows entities within. Compared to Kairos's projectile, however, the ones it generates feature an improvable range, a higher slow rate but affects both players and enemies.
 * Ranking up the tower gives additional clusters and increases their range, and overcharing it only affects the later.
 * Unlike other dispensers, the amount of clusters is fixed and will not increase through waves.

=Gameplay Notes=
 * The Slow Field Dispenser is only available to those with the Road to Elysion DLC.
 * This tower is similar in function to the AR-Mine Dispenser, in that it dispenses objects that function similarly to mines. However, unlike mines, these field generators create hemispherical fields around themselves. Enemies and players within these fields move and attack at a slower rate. Also, while the AR-Mine Dispenser generates new mines on each new build phase, the Slow Field Dispenser only generates fields when built or upgraded up to a maximum of 3.
 * If a dispenser is deleted, all fields that it had generated would also be deleted. This means that it is impossible to hoard a large amount of slow fields from a single dispenser.
 * The slow fields are much more potent than the ones generated by the Kairos. However, unlike these slow fields, the ones generated by the Kairos do not affect the player.
 * Overcharging the dispenser only increases field radius. A Range Spire placed close to the dispenser also increases the field radius.
 * If overcharged enough, the fields actually expand downwards as well, even though ths is not visibily obvious.
 * (slow-field) mines can be carried on top of your head sometimes. Look up to the sky and deploy them. Unfortunately they do not always stick on your head and fall through. This strategy pairs well with the perk Khronos Device. Seems to work more often joining networked games, and less often with the perk.
 * Bumping into ceilings etc while doing this can cause the (slow)mine to shift location to a point where you can't reach it yourself anymore.
 * If a boss (Patriarch/Super Heavy) destroys the dispenser, the fields will remain on the field unaffected

=Trivial Strategies=
 * By placing several slow fields around the core, you can permanently slow lume's attack on it. Four rank 3 slow fields with their dispensers under a rank 3 Range Spire can fully cover a core, though it's not necessary.
 * Shocking Revelation can slow enemies' attack to a minimum with this strategy. Makeshift Cannons that could reach the core also help.
 * It's possible to heighten the slow fields and let them slow air enemies by placing a slow field on a tower.
 * Anti-Air can be a good base to place a slow field on, due to it's price and convenience.
 * With their range increased enough, One can place slow fields on top of the walls instead of the ground, so their radius will affect 2 paths of lumes or fully covers an U-shaped corner.