Good question, Ryan. Hope you don't mind me posting the answer to
the newsgroup.
Anyway: timing concerns are minimized in VtES by design (unlike some
other games).
Erosion simply overrides the base hand damage that a minion has.
All modifiers to that base remain in effect, and merely start counting
from the new base. (*)
So Zack North (with a base +1 hand damage) would be reduced to zero
by erosion, while a Depravity-afflicted Gideon Fontain would do one
damage with a hand strike when erosion is played on him (zero plus
one for Depravity).
Regardless of the above, strikes that do damage based on hand damage
(like Potence strikes and Lucky Blow) would certainly not be "erased"
by erosion - they would add to whatever the minion's hand damage was
at the time.
--
L. Scott Johnson (vte...@wizards.com)
Official VtES Net.Rep for Wizards of the Coast.
(*) - Subject to review by Rules Team
They're both trying to set the same thing: the vampire's base hand
damage. So TS would win out, since it overrides the base that Erosion
had set.
The only problem stems from vampires like Zack who don't have a base
hand damage of one to begin with. It seems like Erosion should wipe
Zack's bonus off, but that TS should still be modified by the bonus.
So, to keep things uniform, it looks like Erosion shouldn't cancel
Zack's +1 damage after all (just set his base to zero, for a total
of 1).