Incursions
Incursions are maps that can be played after a Chaos Trials map has been completed. Upon completing a Chaos tier for the first time (Chaos 1-7), one or two incursions are unlocked for that Chaos tier. Each map has unique playing conditions that are found only on that map, and in Incursion mode. All enemies found on the applicable Chaos level can spawn in lanes, and all DD2 lane bosses can spawn in any lane on any wave.
Upon completing the incursion you permanently unlock a special weapon, which can be purchased from the Wayfarer for 500 defender medals. Special weapons have a chance to drop in the victory chest on the Incursion map that unlocked it, each time it is played. Each special weapon is a legendary drop, for the chaos level it is earned on. Each one will have the first MOD slot locked with a special MOD that only comes on that weapon, and cannot be moved off of it or replaced. The special MOD can be rerolled though. They will also come with a second MOD that is normal and can be moved or replaced.
Chaos One Maps
Chrome Enemies
Map - Forgotten Ruins (Ancient Ruins)
Playing Condition - all map enemies have Chrome mutator, "cannot be stopped", which means that no slowdown effects will work (includes stun, freeze, and slow). All spawned enemies will also have a chrome skin flair applied, but lose it on their death animation. Summoned enemies will not have chrome skin, but the mutator is applied. Note that slowdown animations are still applied (e.g. frozen enemies are encased in ice) but have no effect.
Special Weapon - Tera Blade (light sword for Squire/Dryad/Barbarian). Note that although two different versions of this sword drop with only the Squire or Dryad listed as usable, all three sword using heroes can use either one. Up to two reward weapons can drop in one victory chest.
Special Weapon MOD - Tera Wisp, "fire a wisp that deals XX-XX% Hero Damage. It pierces up to X-X enemies and fires once per a second." C1 values [17.7-38%, 2-5 enemies], C7 values [59.7-80%, 8-11 enemies]. Note - wisp is a short projectile that fires out at chest level horizontally.
Griblock's Horde
Map - Gates of Dragonfall (Dragonfall Town)
Playing Condition - this map has three lanes, two of which will spawn normal C1 enemy schedules. However, each wave one of the three lanes will be designated as the Griblock Horde lane, and will blink red on the schedule. This is assigned at random, and may change lanes each wave.
Special Weapon - Lunar Portal (wand for Apprentice/Adept). Wand has 4 spread, 3 speed, and "diamondshot" which is in the shape of a tight square pattern turned 45 degrees.
Special Weapon MOD - Lunar Caller, "secondary attacks summon Lunar Portals that deal XX% Ability Power as magical damage per second for XX seonds. Up to X portals." C1 values [56-155%, 9.65-17.5s, 1-6 portals], C7 values [116-215%, 18.65-33.5s, 4-9 portals]. Note - the portal is a stationary star with wide range that you place, it then fires a continuous beam from it, attacking a singular enemy (until it dies), and each portal can only attack one separate enemy at a time.