Storm Daemon [SKAVEN]

Bound Spell (Power Level 4); Warlock Engineers only
Once in each of his own Magic phases, the bearer can cast the Warp Lightning spell (the weakest version only; see page 35). The spell requires no Power dice to cast as all the power is provided by the Storm Daemon itself
Roll a D6 every time it is used. On a 1 the Storm Daemon runs out of power and cannot be used for the rest of the battle.