How to deal with Lethos’s plague (Dark Elf)?

I understand the reasoning behind taking Acceleration, but I think it's better to take it as a Light skill. Firstly, it's stronger that way (an Expert skill versus an Advanced skill), and secondly, it also provides an area-of-effect damaging attack, which is very useful for Elves, considering their initiative and the fact that the hero's stats are mainly focused on defense.