Mysterios Dark Elf

Well! Solve the third riddle! If you will can not solve this riddle, you will have to kill the Great Deamon King in order to guess this riddle once again.
Book both my wilfulness and errors down
And on just proof surmise accumulate;
Bring me within the level of your frown,
But shoot not at me in your waken'd hate;
Since my appeal says I did strive to prove
The constancy and virtue of your love.
Say you word: