The good news is that these aren’t hard to find once you can get to them. The bad news is that you won’t be getting your hands on them until the final stretch of the game. Even so, here is where to find Immaculate Platinum Blocks in Code Vein 2.
Immaculate Platinum Block Locations
There are three right after you arrive in the Luna Rapacis area, and you will definitely need all three if you have a +18 Jail on you currently. From the start of this area, head up to the Mistle and activate it, and then head in the direction I am facing in the screenshot below.
The first Immaculate Platinum Block can be found on your left before the terrain changes to a tunnel. It is guarded/blocked by a regular enemy variant of the Metagen Remnant boss from Josee’s story. I am at level 125 with a fully upgraded Ame-no-Habakiri and Zenon’s A-Rank Blood Code. It wasn’t a simple fight, but it wasn’t a hard one.
Once you have this one picked up, head down into (and through) the tunnel. When you come out the other side, there will be two enemies. The yellow pickup near the big enemy will actually be two Immaculate Platinum Blocks in one.
Fortunately, you can get this one and get out. You could probably nab the first one without fighting as well, but I figure it’s worth the Haze to fight it. With both in hand, either head back to MagMell and talk to Jadwiga downstairs from the weapon shop, or find one of her minions to enhance your Jail.
The one Immaculate Platinum Block will upgrade your +18 Jail to +19, and the other two will get it to +20 and get you the Demon Eater trophy/achievement.
As Insula Carcere had all the items needed to max out one of your Bequeathed Formae and a weapon that needed Tender Light Stones, you shouldn’t be missing too many more trophies/achievements by this point. There’s nothing missable, you can just enjoy the last chunk of the game from here and do whatever clean up later.