Kroothawk wrote:

 Shadowclaimer wrote:
Vespid leaders are controlled through the use of their helmets, which then are used to control the drones.
Its just an idea I'd like to explore for potentially controlling space marines under Tau alliance.

1.) Even the Codex describes this as a vague idea, not as proven fact.
2.) Not even die-hard Tau-haters think that this works on humans or even Space Marines.
3.) Space Marines joining the Greater Good is on par with Chaos Grey Knights and female Space Marines: It will create an uproar from any of your opponents vaguely familiar with 40k background.
4.) If you read about Tau background, you will see that Water Caste never leads an army. This contradicts the strict separation of caste duties fundamental to Tau society.

You asked for feedback for your idea. If you don't like the feedback, it isn't necessarily my fault.

The Tau Water Caste is made up of merchants, diplomats, and administrators. They are responsible for maintaining effective interaction between the castes, as well as communicating with and supervising the integration of alien species into the Tau Empire. Members of the Water Caste tend to be taller and more slender than other Tau, and their features are softer and more expressive. Water caste Tau will frequently adopt mannerisms and cultural habits of the races they deal with, although this is often done to promote communication with other races.

Water Caste members are bureaucrats, politicians, negotiators and administrators. They are the merchants and diplomats of the Tau Empire, moving in and around the other castes to ensure that Tau society functions smoothly, always in the service of the Greater Good. Water Caste members often accompany Tau expeditionary forces to negotiate safe conduct through alien star systems and smooth the passage of Tau merchants and colonists. Servants of the Imperium of Man should be aware that these Tau are exceptionally skilled at manipulating weak-willed individuals and every remark addressed to a member of the Water Caste must be carefully considered and phrased to prevent any sensitive information being divulged.

 Kroothawk wrote:
Next time you ask for advice for an idea, make it clear that everything but enthusiastic approval is considered derailing the thread.

 ph34r wrote:
Space marines in a Tau army is a classic fluff abomination that every new Tau player wants. Water cast don't have "something else at play" and I know of no fluff that hints that they have mind control powers over whatever enemy they want. If the Water Caste does not have mind controlled IG forces and still has to rely on people being converted ideologically to the greater good there is no way they are going to get Space Marines. This seems like a stretch at best and bad fanfiction at worst.

 blood lance wrote:
Also. Read your codex. Everything you asked for proving fluff wise this doesn't really happen is in there. Stop being an arse.