Changes

Playing Condition - this stage is very similar to a Chaos 4 expedition of the same map, however a new enemy and mechanic involving Spectral Knights have been added. All air and ground lanes are the same as normal play. This incursion assigns two mutators to each lane from the common pool of mutators. All normal lane bosses can spawn, and with separate mutators. Once each wave begins, at some point during the wave a Spectral Knight will spawn from any of the ground lanes. Spectral Knights are large, floating Squire-like ghosts that cannot be damaged by any weapons or stopped by any defense or barricade. They slowly move on the enemy path they spawn from directly towards the crystal, and do not stop until they get there. Once there, they attack the crystal doing 500 points of damage a second, which is relatively a small amount. They do not harm any defenses or heroes. Each Knight is colored Red, Green or Purple and when they spawn the game message will tell you what color they are, and the message text will also be in that color as well. The Knights are not shown on the mini-map, but are represented on the actual map by a skull and crossbones icon of the same color that they are. Keep this in mind as you cannot tell by looking at the map how close they are to the crystal. To fight the Knights, you must use an environmental mechanism found on only this stage. Under the center of the map, there is a lower level in the shape of a horseshoe, that exits out at each of the 3 major spawn sections. On either side of each exit inside the horseshoe, you will find an altar with a sword, with 4 total altars. You can interact with the altar, which cause it to change color from red, to green, and then purple - always in that sequence. To vanquish a knight, you must set all four altars the same color as the knight you want to vanquish. Once all 4 are the same color, approach any of the 4 altars to receive a color debuff, as shown on the screen as an attack symbol in the color of the altar, and it will last 45 seconds. You should get it automatically when you set the 4th altar, but you can reset the 45 sec timer at any time by just approaching any of the 4 altars. Each knight floats in the air, but has an aura underneath it as a large colored circle. To vanquish the Knight, simply place your hero inside of that circle, or jump into the Knight, while you have a debuff that matches the same color. If successful, the Knight will vanish and a message will say "The Spectral Knight has been cleansed". You will lose the debuff once a Knight is vanquished, so if you have another Knight of the same color you also want to vanquish, you will need to approach one of the 4 altars again, and then approach that Knight. You can only carry one color debuff at a time, so if another Knight of a different color is also on the map, you must set all 4 altars to that color, get the debuff, and go inside its aura to vanquish it. The debuffs do not stack. The amount of Knights that spawn, when they spawn, and what color they spawn as are all random, but spawn rates do increase in frequency as you advance to each next wave. At the end of each wave, all 4 altars reset back to no color. You can interact with altars on the building phase, so it can be helpful to set one color before the wave starts. Each wave ends when the total amount of enemies are destroyed, and there is no requirement to cleanse any knights. All Knights on the map will vanish when the wave ends. Slow spawning enemies, slow moving bosses, or stuck units can make the match continue on, so ensure to clean-up all units quickly to bring the match wave to an end. It can be faster to clean up units, rather than adjusting 4 altars and debuffing a knight, so plan a strategy to finish each wave accordingly. The Knights do not damage the crystal very much, but several Knights can multiply the effect, so keep an eye on them. A Knight may spawn after the map is over, but it is of no consequence if it does.