Invisibility

Invisibility is a feature in Woomy-Arras.io that allows certain tanks to turn invisible. Most invisible tanks have a slightly tapering cannon or a triangular topper on top. Smashers that can go invisible often resemble Landmine in some way. Cruisers that can go invisible typically have a slightly altered barrel arrangement, generally resembling Submarine.

Technical
Invisibility varies between tanks, with some tanks, like the Surprize, turning invisible almost instantaneously, and most other tanks taking a few seconds to turn invisible. Excluding the Surprize, all of the Landmine-branch tanks take several seconds to become invisible. The VPN, its health bar, and its bullets are partially invisible at all times. The Minesweeper-branch tanks are able to see invisible tanks.

Some tanks fire invisible or partially invisible ammunition, despite not being invisible themselves. Tanks include the Maleficitor and the Minelayer. The Ninja can spawn probes that will stay invisible and not attack when invisible.

Almost all invisible tanks no longer become invisible when they fire or move, with the exception of Submarine, Shipyard and Sonar which can remain invisible even while firing, and the VPN which is always partially transparent no matter what.

For balancing reasons, AI players and the Vis Destructica will move and attack if an enemy entity approaches, making their invisibility rather useless except for catching distracted players off guard.

Trivia

 * As of an update, invisible tanks become extremely hard to see rather than completely invisible.
 * Lances and flails have bullets rapidly trailing them when viewed with a or a -branch tank, confirming that lances and flails are just barrels that constantly shoot bullets that despawn almost instantly.