Help with Giant instinct Barbarian weapons and reach

Being a pedant for a second: it's a Mandela Effect, named after incorrect recollections of Nelson Mandela's death.

A mandala is a visual meditation aid in Buddhism.

You don't get Reach by default. The Giant Instinct specific feats each give you greater Reach if you take them.

There is a blurb in the gm core that says large creatures typically have reach. But that's more of a guideline when making custom or improv creatures.

Two things: there's a higher level feat (Titan Stature) for an additional +5 reach, and most people doign giant instict for reach pick a weapon that's reach by default.

Not by default

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I don't think you get extra reach for having weapons built for larger creatures but your reach does increase the larger you are.

So if your weapon is built for a large creature you take the clumsy condition and I don't think bastard swords have +5 reach so your reach is still 5. You gain clumsy 1 because your weapon is no longer too large for you so you lose the original clumsy 1 condition.

With Giants Stature you become large and gain the +5 reach because large size still has a reach of 5ft or 1 square based on the table here

So at level 6 you have a bastard sword, +5 reach, you occupy a 10x10 (2x2) block and threaten a 20x20(4x4) block.

Edit: at level 12 you would have a total of +15 feet from titan stature and huge size.