The only exceptions are the Ur-Dragon and a handful of bosses on Bitterblack Isle, including Death and Daimon. The Maker's Finger will not instantly kill them, but instead only takes one full health bar.

Can the makers finger kill Grigori?

The Maker's Finger can slay The Dragon (Grigori) in a single shot. The Seneschal is immune to this arrow.

How do you farm blast arrows in Dragon's Dogma?

They can be bought from Aestella's in Cassardis (unlimited stock Post-Game), at Camellia's Apothecary in Gran Soren (unlimited stock after the quest Come to Court), and from the vendors Jayce and Mathias, who have a limited stock available from the start.