Some creatures do not advance in an even manner, rushing forward at one moment, only to falter clumsily in the next.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
Random Movement (*)URL Copied!
Models with the Random Movement special rule do not have a normal Movement characteristic, but rather a dice roll, such as D6, 2D6 or 3D6 (as indicated in the brackets). This is the distance they move, charge, pursue, overrun and flee – they cannot march. If a model has the Random Movement and Swiftstride special rules (a chariot with Random Movement, for example), then the Swiftstride special rule is not used. Note that certain Random Movement rolls can result in the model having a Movement value higher than 10 – this is an exception to the usual maximum.
Models with Random Movement cannot declare charges, and must always move in the Compulsory Moves sub-phase. When the model moves, first pivot it about its centre to face the direction in which you wish it to travel. Then, roll the dice shown in the Random Movement brackets. Finally, move the model directly forwards a number of inches equal to the total rolled by the dice. No other pivots can be made.
There's a chance that the model's peculiar movement will cause it to come into contact with an enemy, so measure the distance in a straight line before the model is moved. If the move is found to take the unit’s front arc into contact with an enemy, then it counts as charging, and this is resolved using the normal rules for charges and using the distance rolled as its charge range. Charge reactions cannot be declared against enemies with the Random Movement special rule.
If the random move brings the unit to within 1" of a friendly unit or impassable terrain, it stops immediately and cannot move further during that Movement phase.
If two or more models in a unit have the Random Movement special rule, pivot the unit about its centre, then roll the dice only once to determine how for the unit moves. If models in the unit have a different Random Movement value, use the slowest for the entire unit.
A Random Move counts as a ‘normal’ move for triggering a Dangerous Terrain test, unless the model is making a charge, pursuit or flee move, in which case it counts as a move of the appropriate type.