Spiked Chain Training and using a spiked chain as a double weapon

[Shin Okada]

This feat says,

Benefit: You gain proficiency with the spiked chain. You can treat the spiked chain as a double weapon. As a double weapon, each end of the spiked chain is a light blade and deals 2d4 damage. The primary end gains the stout property, and the secondary end gains the off-hand property.

Well are those weapon group (light blade) and properties (stout/off-hand) are added to those spiked chain already has? Or will they replace the original ones?

I mean

1) Added

As a double-weapon, the primary end is Flail and Light Blade, and has Reach and Stout properties. The secondary end is Flail and Light Blade, and has Off-Hand and Reach Properties.

2) Replace

As a double-weapon, the primary end is Light Blade but not Flail, and has Stout property only. The secondary end is also Light Blade but not Flail, and has Off-Hand property only.

 

[Aulirophile]

The first. Nothing says to remove the properties it has, so you don't.

 

[Shin Okada]

The first. Nothing says to remove the properties it has, so you don't.

Thanks. That was my guess but I wanted some third person opinion.

 

[DracoSuave]

Correct.

It remains a flail, gains light blade, retains reach, and gains stout on one end, off-hand on the other.

And it also becomes two implements for Swordmages look at me I open cans of worms

 

[redpanda9909]

Wht feat is that?