Here are some clarification about the Bloodline 'Tiers' that will come. It will not be a real Gameplay future in a sense that it's more about 'Fluidity' in the Bloodline mechanic than anything else.

What i mean by that, is that if i want to keep a certain form of crossbreeding between the bloodline, i will need to categorize them.

'Pure Bloodline' : Bloodline that can blend with any other bloodline of the same tiers (Sun)
'Impure Bloodline' : Bloodline that can't blend with other Impure bloodline Bloodline (Pristine)
'Mixed Bloodline': Bloodline created from Crossbreeding and can only blend with Pure BL of the same tiers (Grey)

Tiers 1 Bloodline : Can be choose from the start (Sun, Pristine)
Tiers 2 Bloodline : Can't be choose from the start (Grey)

The new bloodline will be a Tiers 1 Impure Bloodline. Able to mix with the Sun, but not the Pristine nor the Grey. The resulting bloodline will be a Tiers 2 Mixed Bloodline. In the far future i will certainly add a Pure Tiers 2 Bloodline, but it's for far ahead.

After the Next Update, the BL tree should look like that :

Pristine + Sun = Grey
Sun + New1 = New2