A advantage; you can use the spell movement<em>now</em>. As next round you can perform full attack on wights in melee range and in any position :P. So you can flank and such.<br/><br/>So acting last for this spell is ideal; as after all have moved I give them extra movement and those who act before wights get max possible advantage. I did not use it on Voloke because he could had moved only one possible square for wights where as Serge and Wren have lot more options. With base movement I mean 30'ft (or 40'ft with barbarian). Also this movement ignores your armor slowing down elements but I think none have heavy or medium armor which slows their movement to 20'ft?