Darkstorm Portal

The Darkstorm Portal is the special event boss of the Dark Storm Conquer event. During that event, it may randomly appear in a round between 86 and 154 and overtake that round (it has a 75% chance to appear on Lightblast Forest and Crystal Mountain, on other tracks it has a 25% chance). It also has a message that appears when it appears, saying "The Darkstorm Portal is coming, the legendary Dark Portal of Lightblast! Prepare....".

DarkStorm Portal
BGM: Space Truckin's background music

Unlike other Event Bosses, when this appears, the track changes to a dark area: the DaRkStoRM PorTAL Dimension. The DarkStorm Portal does not move (well it's a portal!), but rather simply stays in the middle and throws bloons that follow the track and after reaching the exit become invulnerable to all attacks and fly to the portal. It has 7500 HP on Lightblast and Crystal Mountain, but on other tracks, 5000. It's abilities are: After you defeat this form, the screen will darken and quickly fade as your towers will be teleported to a special track named DarKBlaST FoREsT LigHT RemoVED LX.
 * Dark Storm: Spins once, then throws a small, almost invisible orb which'll then transform into bigger orbs and form a storm of 25 orbs that fall down. Each orb deals 5 HP damage.
 * Tower Suck: Sucks in 3 of your towers and throws them out after 2 seconds. Watch out: their power will be permanently lowered by 25%!
 * Tower Build (always used right after Tower Suck): It actually also gains energy after sucking the towers! It'll spin and create a tower with the energy gained from the towers. The built tower will heal the portal by 25 HP every two seconds and shoot orbs at the portal, increasing the building energy! These towers will also shoot orbs at your towers, harming them by 5HP. These towers have 50HP each.

LX DarkStorm Portal BlaCK HolE
Wait... HOW DID A PORTAL SWITCH FORM AND TELEPORT!? So the annoying portal has returned, now looking more like a strange mech created by the monkeys rather than a dark hole of the past! The LX DarkStorm Portal BlaCK HolE (Light X Dimension Stormer of the Portal Bloon Crystalline K-15 Eternal) is the new target that has NO HEALTH POINT AT ALL! Instead, this uses a different type of health system, called Darkness Points. Basically, it is how much darkness power it has. It has only 100 DP, and is reduced by an item called the DP ReduCE, dropped by Dark Crystals It'll make your towers be able to reduce it's DP. Each attack reduces it's DP by 1. Watch out, it'll heal 10DP every 10 seconds.