When wax has been melted and reapplied over and over again, it can turn into fragile resin. This makes the edges of a Waxer sharper and more dangerous, but much more brittle.
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Description
Wickstone is effective on units who have the Burnout affix (assuming that it would be advantageous for the unit to live longer, which isn't always true). The +1 Burnout doubles the life time of the Draff, the +5 bonus is effectively doubled with Multistrike, and the +5 bonus helps against units with Sweep.
Alternately, Immortalstone is effective on units with low Burnout values. The Draff is cheap and only occupies one Capacity, so it could absorb a hit for your front line unit or deal its decent default damage to the front line enemy unit.