Hexwraith

Attacks made by Hexwraiths and Hellwraiths in close combat have Flaming Attacks and Ignores Armour saves.

Hexwraiths and Hellwraiths can move through unengaged units (whether friendly or enemy) during the Remaining Moves sub-phase, but cannot end their movement within 1" of another unit.

All units with Undead have Animated Construct, Fear, and Unstable. However, they may make march moves if they are within 12" of the army's General.

Models that cause Terror also cause Fear. In addition,
the following rules apply. Fear-causing models or
models with Immunity (Fear) treat Terror-causing
monsters as causing Fear, rather than Terror – this is an
exception to the rule that makes Fear-causing creatures
immune to Fear. Terror-causing models have the
Immunity (Fear/Terror) special rule.

Run for Your Lives!
If a Terror-causing creature declares a charge, the target unit must immediately take a Panic test. If the test is passed, all is well and the unit can declare charge reactions normally. If the test is failed, the unit must make a Flee! charge reaction. Note that, if the target unit is not allowed to take any charge reaction (if, for example, the Terror-causing unit charged as a result of a pursuit or a random move), then the target does not take this test.

If a unit wishes to declare a charge against an enemy that causes Terror, it must take a Psychology test to overcome its terror first. If the test is failed, it may not declare the charge against the Terror-causing unit, but may choose to declare a charge against another unit following the rules for Redirecting a Charge. If the Psychology test is passed, the unit may declare the charge as normal.

Vanguard
Fast Cavalry automatically have Vanguard.

Free Reform
Unless it charges, Fast Cavalry is allowed to reform twice during its move without losing any Movement; once before they move, and at the end of their move. The unit may do this even if it marches, provided that no model ends up moving a number of inches higher than double its Movement value.

Fire & Flee
A unit of Fast Cavalry armed with missile weapons can choose Fire and Flee as a charge reaction. If it chooses to do so, the unit will first fire upon the target following the rules for Stand & Shoot. After this, the unit makes a flee move. However, it may not use its Swiftstride if it does so, and the normal -1 To Hit penalty for moving and shooting still applies.

Feigned Flight
A unit of Fast Cavalry that chooses Flee or Fire & Flee as a charge reaction does not cause Panic from fleeing through friendly units and automatically rally in its next Compulsory Movement Phase (unless it is forced to Flee again from another source). In addition, it is then also free to move during the remaining moves part of the Movement phase. The unit is also free to shoot as normal (but always counts as having moved). Note that if the flee move of the Fast Cavalry does not take them beyond the charge reach of their enemies, the unit suffers casualties as normal.

Fire on the March
Fast Cavalry armed with missile weapons are experts at shooting from horseback and can therefore shoot during a turn in which they marched or reformed (providing their weapon doesn't have Move or Fire). However, the normal -1 To Hit penalty for moving and shooting still applies.

Characters
A character model that joins a unit of Fast Cavalry gains Fast Cavalry as long as they stay with the unit. Characters may only join Fast Cavalry with the same Troop Type as them.

Armour Saves
Units containing one or more models with a close combat armour save better than 5+ and/or barding cannot use Fast Cavalry.

Ethereal creatures treat all terrain as open terrain for the purposes of movement. They may not finish their movement inside impassable terrain. They are never slowed by any special rule, spell or item that would otherwise reduce their movement or stop them from moving completely.

The Models have both the Magical Attacks and Unstable. Ethereal models can only be wounded by spells, magical attacks and magic weapons or effects. Ethereal creatures block line of sight normally and cannot see through anything that would block the line of sight of normal units. Characters that are not themselves Ethereal are not permitted to join units that are (even if they become temporarily Ethereal for some reason).