I recommend killing the Ferrica and Ferrina birds because they are easy to knockdown and kill as well as having a fast respawn. There is a particular spot I used to grind this item, which is shown on the map below. In that spot the birds are more dense and you can easily pull full packs by just hitting the blue ones. They have around a 10 second respawn time.
This area has a recommened minimum AP of 210. I am honestly not sure if your mastery effects the drop rate (I would presume it does) so try to use your lifeskilling character if possible, or a Magic Tanning Knife to improve your luck.
As well as dropping the completed Valtarra’s Clairvoyance, you can drop Valtarra’s Memory. Once you have x100 Valtarra’s Memory you can go to Merindora to show her the items. She will give you Valtarra’s Nail x1. You can then combine the Valtarra’s Memory and Valtarra’s Nail into a Valtarra’s Clairvoyance using Simple Alchemy.

Item 2: Markthanan’s Gland
This item is obtained as a rare drop by grinding monsters at Tshira Ruins. The mobs which drop this piece are: Leaf Keeper, Vine Keeper and Grove Keepers. This area has a recommened minimum AP of 140. Monsters in this area also drop Garmoth’s Scale which are needed for other infinite potion items.
As well as dropping the completed Markthanan’s Gland, you can drop Katzvariak’s Venom. Once you have x100 Katzvariak’s Venom you can go to Merindora to show her the items. She will give you Markthanan’s Greed x1. You can then combine the Katzvariak’s Venom and Markthanan’s Greed into a Markthanan’s Gland using Simple Alchemy.

Item 3: Narc’s Crimson Tear
This item is obtained as a rare drop by grinding monsters at Manshaum Forest. The only mob that can drop this piece is Manshaum Shaman. This area has a recommened minimum AP of 240. Monsters in this area also drop Rumbling Earth Shards which are needed for other infinite potion items.
As well as dropping the completed Narc’s Crimson Tear, you can drop Narc’s Solace. Once you have x100 Narc’s Solace you can go to Merindora to show her the items. She will give you Narc’s Tear x1. You can then combine the Narc’s Solace and Narc’s Tear into a Narc’s Crimson Tear using Simple Alchemy.

Item 4: Krogdalo’s Protection Stone
Once you have the first 3 items, you must go to the NPC “Merindora”. She is located on the east side of Grana and will have a quest for you to complete to gain some knowledge. You must unlock this knowlege before being able to exchange the other items.

You then must go to Krogdalo’s Trace, who is the node manager of Krogdalo’s Trace (northwest of Grana). Here you will be able to exchange 100 Rumbling Earth Shards for the 4th item. Rumbling Earth Shards are obtained by exchanging Horse Race Seal x1, Shiny Golden Seal – [Imperial Training] x2, OR Peridot Leaf x15. There are also drop when killing some monsters in Kamaslyvia and can be bought from the central market.

Item 5: Night Crow’s Dawn Stone
Once you have the first 3 items, you must go to the NPC “Merindora”. She is located on the east side of Grana and will have a quest for you to complete to gain some knowledge. You must unlock this knowlege before being able to exchange the other items.

You then must go to Forboding Altar, who is the node manager of Garmoth’s Nest in Duvencrune. Now you will be able to exchange 100 Dragon Scale Fossils for the final item. Dragon Scale Fossils are obtained as a drop from some monsters in Duvencrune and can be bought from the central market.
