Unbreakable

It's available now, the new patch will work with your old saves, as long as the names on the save files match the name on the rom.  The link on the first post has the current IPS patch, beta 0.03 and an updated changelog.

Sorry, I meant "When does the Berserker become available while playing the game?", although my first statement is technically ambiguous.  If it is a unique Relic that isn't available until the Floating Continent, for example, then I shouldn't be able to equip it yet.  If it is a cheap Relic available from the first time that I reached South Figaro, then I can.