So I can get two blood rocks from the main game + DLC and four more blood rocks per NG cycle from the bottom layer chalice dungeons. But Blood Chunks are the real bottleneck. Need 16 of them to upgrade one weapon, and they cost 20 insight each. I got enough to upgrade four weapons in my recent play through. Not sure I collected them all. But it feels like its easier to collect 6 blood rocks than 16*6 Chunks.
Edit wiki says there are like 46 in the main game, that's not enough to upgrade three weapons. Not sure about the DLC. I know you can get them by RNG too though.
Edit wiki says there are like 46 in the main game, that's not enough to upgrade three weapons. Not sure about the DLC. I know you can get them by RNG too though.