Talk:Ur-Dragon/@comment-99.19.4.14-20140126045111/@comment-5166842-20140126090213

It's the only way to visibly affect his health. Depending on the heart you hit it can take up to 20% of one health bar, but when you reenter for another round his health will usually be back where it was before you hit him with the MF, sometimes a bit higher or lower. If you have money to burn there's no harm in using a Maker's Finger on him, otherwise save it for the grace period, when it'll really count.