I couldn’t verify a reliable method for “4ace v2 haze seaswater” from the results I found, but the closest confirmed guide shows that Sea Beast-related V2 items in Haze Piece/Haze Seas are usually obtained by progressing to Sea 2, spawning Sea Beast, and then farming its drops. The Sea 2 guide says you need the required score from the starter island NPC to unlock the second sea, then travel there through the NPC again.

What the available info suggests

  • Sea 2 access first. The guide says to talk to the starter island NPC and bring the required score, then you can teleport to Sea 2.
  • Sea Beast farming. Another guide says Sea Beast spawns in the ocean every 15 minutes near players, and that the Sea Beast Hammer v2 drop chance is around 3.5%.
  • Likely drop-based item. The naming in the videos suggests this kind of weapon is usually not a simple shop purchase; it comes from beating the Sea Beast and hoping for the drop.

Practical route

  1. Unlock Sea 2.
  1. Go into the ocean and wait for the Sea Beast spawn cycle.
  1. Defeat the Sea Beast with a strong group or high-damage build.
  1. Check the drop, since the V2 weapon appears to be a low-chance reward.

Caution

The exact name “4ace v2 haze seaswater” does not match the clearest source names I found, so it may be a typo, a newer item, or a community nickname. If the item you mean is actually Sea Beast Hammer V2 in Haze Piece/Haze Seas, the farming steps above are the best-supported answer from the available sources.

TL;DR: unlock Sea 2, farm Sea Beast spawns in the ocean, and keep defeating it until the V2 drop appears.