Tentacle Discovery and Wielding Weapons

[Falkyron]

If an alchemist has the tentacle discovery, can it wield and use weapons without penalty in that extra limb? I'm seeing a lot of table variance.

[VoodistMonk]

No variance necessary...

Tentacle allows a tentacle attack with the grab ability.

Vestigial Arm, another simple Discovery, allows you to wield a weapon or shield.

Tentacle does not wield weapons or shields, it simply adds a natural attack to your otherwise unmodified attack routine.

Vestigial Arm contains the wording to support in full attack routines, specifically mentioning TWF.

[Scott Wilhelm]

VoodistMonk wrote:

it simply adds a natural attack to your otherwise unmodified attack routine.

Oh my, no.

Tentacle wrote:

The tentacle does not give the alchemist any extra attacks or actions per round

You can make attacks with the Tentacle, but you do not get a Tentacle Natural Attack. You have to use one of your regular attack slots to attack with a Tentacle.

Furthermore, were you playing a Tengu and you tried to Bite and attack with your Alchemal Tentacle as part of your Full Attack, your Bite Attack would suffer the same penalty as if she attacked with Bite and Katana. The Bite would suffer a -5 on the Attack Roll and would only get 1/2 the ST Mod to Damage, demoted as it were to Secondary Natural Attack.

An Alchemal Tentacle is a Natural Weapon--you can cast Magic Fang on it--but it does not grant a Natural Attack.

[VoodistMonk]

Sorry, that is what I meant by otherwise unmodified attack routine. It is a natural attack, but absolutely replaces your attack action to use. It doesn't grant you a natural attack to use WITH your attack action.

The language in the Vestigial Arm Discovery is what you are looking for.