talk to daritha (she is in the building behind tarsengaard storage)
she will eventually ask for 40 leather torso armor
make them or buy them from the blacksmith in whitestone city (4000K)
put them in your storage and wait for a SUN TZU day to give them to her
the prize is 60 K att/def ..BUT ..if you give them to her on a sun tzu day AND
are serving an attack or defense god...your prize will be well above 100K att/def ..easy level up right ?