Okay I have a few questions regarding Magus, Kobolds, and their interactions.
1. Can a Magus do a Spellstrike with a Tail Weapon?
2. Can a Magus do Spell Combat with a Tail Weapon?
3. Can a Blackblade be a Tail Weapon?
4. Do Tail Weapons get iteratives?
4. No.
Kobold tail attachments augment the tail slap natural attack.
There IS a Magus that can use natural attacks, but I can't remember what it is, right meow.
up until i read the following i was going to say it's a natural weapon. then i saw this:
"Tail attachments can be constructed of special material and made into masterwork or magic items." (including the above that named them light weapons) this make zero sense in natural weapons (there are no masterwork natural weapons\items). so yea. i think we can call it up as manufactured weapon and end it. (the same as the catfolk clawblades)
1. Can a Magus do a Spellstrike with a Tail Weapon?
Yes, all Spellstrike requires is a melee attack with a weapon, and in the "manufactured weapon, unarmed strike, or nautral weapon" meaning of the term.
2. Can a Magus do Spell Combat with a Tail Weapon?
No. Spell Combat requires using a hand to attack, confirmed by this FAQ,
3. Can a Blackblade be a Tail Weapon?
"A black blade is always a one-handed slashing weapon, a rapier, or a sword cane". All Kobold Tail Attachements are Light Melee Weapons, and thus don't qualify.
4. Do Tail Weapons get iteratives?
Yes. The text about "augment his natural attack" appears to be flavor text/explanatory text, and the actual rule text says "Tail attachments are light weapons". Thus, they behave like other manufactured weapons, which includes iterative attacks.