Cute idea about Ms and Ws, Graham. Now, with my pedant's (fur) hat
on, I'd take issue with Bruce's suggestion of 'masterstvo' as that
tends to have more of a sense of 'masterful' than 'mastery of an
ability' (which would be 'obladenie'). But given that I'm anyway
twisting history and reality in ways both minor (including vodka,
for example, even though that actually came to Russia later) and
major (magic, for gods' sake!) I see no reason to be pedantic, so
consider your suggestions gratefully accepted.
All the best
Mark