EDIT: I misunderstood the card negatively, which is funny because I was very much pleased with it to start with! This should reflect how good the card is better:
I'm a fan of Wither, a cheap asset that can be used infinitely kill off problems that aren't worth charges from other assets, it's a great backup weapon, 1-off, or to dual wield with Shrivelling or Enchanted Blade or Ornate Bow or Timeworn Brand (I.E, a fight heavy whose role is to kill things, like many forms of Agnes Baker, Diana Stanley and Jim Culver). "Super archmage" builds with Sign Magick will also be interested. The -1 fight and evade trigger is surprisingly useful in making hits land or getting out of trouble.
So, the upgrade is worth it's XP cost because:
- The -1 health effect reduces the written HP total of the target by 1 and triggers whether or not you actually hit, this can create some funky circumstances such as:
- You shoot a 2-hp foe a and get a token, killing it in one attack.
- You miss a damaged enemy, but draw a special token, reducing their health total enough to make their existing damage kill them anyway!
- The +2 and special trigger combine to make Wither very, accurate. The largest penalties are often keyed on tokens and Wither innately resists those.
Layer all of this with Wither's initial ability to infinitely channel into damage and you've got yourself a very good attack spell, whether it's for the 5- juggernaughts who do everything via or the 4- midrangers who like to use their other stats for things and miss the occational spell charge.
This card stands out as being FAR more impressive than it seems at first glance, especially in the latter half of a campaign where special tokens tend to be much more numerous. Wither a very impressive attack spell that manages to stand alongside without replacing Shrivelling.
Edit 2: After now playing in 3 campaigns with Wither, I'll stand by it except in 1 circumstance. In a skillful and informed playthrough of Dunwich you might manage to not actually add any special tokens to the bag, in this case Wither looses much of its luster.