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Take this with a pinch of salt as Eldar jetbikes movd quickly, but depending on the size of the table and where the Farseer is on the turn of the deep strike, you have a radius there of where he can move the Farseer to cast powers and therefore where he will deep strike the unit. These are big ranges so might not even be possible on a regular table but thought it was worry a mention. May help with protecting rear armour at least!

Have to agree with a lot of the posts I just read. D-scythes and mass shuriken fire (therefore multiple guardian units, well positioned).

Swooping hawks anyone? S4 grenade pack, no cover saves.

It is perfectly clear, it just suffers from wishful thinking.

It's important to clarify because casting on a bomb from reserve, or things like guiding Warwalkers when they come on is cheating that has obvious major game consequences.

To contribute otherwise, a full boat of Firedragons with a perfect timing makes short work of it.

It is illegal to cast powers when the psyker comes in from reserve. If the psyker is already on the table at the start of the turn, due to the wording of the faq, can cat powers after units arrive from reserve.

Hit him with Reveal, then hit him with a salvo from a unit of Dark Reapers. Problem solved.

Only warlocks and spirit seers can cast conceal. The target for conceal is the warlock or spirit seer, and it effects his entire unit. Warlocks can only join one of the 4 types of guardian units and can never join a tau unit. The only possible way to have conceal work on a Tau unit is for a spirit seer to join the unit. Spirit seers can not take jet bikes.

Under the assumption a TO rules against casting blessing on units arriving from reserves some blessings will still work under the following conditions.

1) The target is always the psyker casting the spell, and it effects his unit similar to conceal. The psyker can just cast it on himself, leave his unit, and join the bomb.

2) The psyker is not attached to a unit at the start of the movement phase. As a lone wolf his unit has the blessing, and once he joins a unit there is nothing saying that blessings are lost. The problem with lone wolfing it is he better have a damn good place to hide because your opponent has a full turn to paste the lone farseer.

What will not work is powers like prescience that say target a friendly unit within x number of inches. If the farseer is in a GJB squad or attached to a T7 support battery and blesses the unit then the target of the blessing was the unit, not the farseer. Possession of the blessing stays with the original target of the blessing when the farseer detaches. Most places I know don't allow psykers to snipe a specific IC within a squad when blessing a squad. This is sticky YMTC territory

All of that being said if the Tau player wants eldar blessings on the bomb then it makes his battle plans predictable because the bomb will just follow the spirit seer and farseer.

 Homeskillet wrote:
Hit him with Reveal, then hit him with a salvo from a unit of Dark Reapers. Problem solved.

The problem with this is that it needs to be cast on a model in 18 inches before movemement, they are a very weak leadership 8, and if the farsun bomb drops in range of that they are idiots if they don't kill it.

Matt2429 wrote:

 Homeskillet wrote:
Hit him with Reveal, then hit him with a salvo from a unit of Dark Reapers. Problem solved.

The problem with this is that it needs to be cast on a model in 18 inches before movemement, they are a very weak leadership 8, and if the farsun bomb drops in range of that they are idiots if they don't kill it.

Bigger problem for the farsun bomb is they need to deep strike near a friendly spirit seer and their movement is then limited to 6" per turn because their spirit seer is on foot.

 Happyjew wrote:
It is illegal to cast powers when the psyker comes in from reserve. If the psyker is already on the table at the start of the turn, due to the wording of the faq, can cat powers after units arrive from reserve.

Citation please, because the only FAQ I'm going by is this one:

Q: Blessing are manifested 'at the start of the psyker's movement phase' - does this mean they happen simultaneously with Reserves rolls, Outflanking rolls, etc and if so which is resolved first? (p68)
A: They do occur simultaneously - as such, the player whose turn it is decides in what order these things occur as per page 9 of the Warhammer 40'000 Rulebook.

Quark has already provided a clear breakdown of order of operations for those who have trouble getting their head around the difference of 'rolling for reserves (a start of movement phase action)' vs 'moving units onto the table from reserve (part of the movement phase

1) Beginning of movement phase
1a) Roll for Reserves/Outflank side
1b) Cast Blessings/Maledictions
2) Movement

Once you have actually picked up a model and placed it somewhere it wasn't, whether it was already on the table, entering from a board edge, or entering from Deepstrike, a unit has moved and you are no longer 'at the start of the movement phase' and thus cannot cast psychic powers, roll for any other reserves you might have, or perform any other 'start of movement phase' action.

I'm going to need a little bit more than 'you're wrong/this is a debated issue/there is no concensus' on this one. If you can't address the argument with some actual rules and FAQ text outside of p68 and the above, there is no debate, only wishful thinking.

Matt2429 wrote:

 Homeskillet wrote:
Hit him with Reveal, then hit him with a salvo from a unit of Dark Reapers. Problem solved.

The problem with this is that it needs to be cast on a model in 18 inches before movemement, they are a very weak leadership 8, and if the farsun bomb drops in range of that they are idiots if they don't kill it.

schadenfreude wrote:

Matt2429 wrote:

 Homeskillet wrote:
Hit him with Reveal, then hit him with a salvo from a unit of Dark Reapers. Problem solved.

The problem with this is that it needs to be cast on a model in 18 inches before movemement, they are a very weak leadership 8, and if the farsun bomb drops in range of that they are idiots if they don't kill it.

Bigger problem for the farsun bomb is they need to deep strike near a friendly spirit seer and their movement is then limited to 6" per turn because their spirit seer is on foot.

True story.

Matt2429 wrote:
thats kind of a stretch isin't it? you have 1 in 6 chance of rolling that power and asusming you have multiple warlocks and get the power a few times there is still a farseer in that squad that can re roll deny the witch on a 3+

conceal/reveal is a primaris power.

How do you get a 3+? I see only a 4+ deny (though it is reroll able with fortune up)

I'm not an eldar player or a tau player so this may sound stupid, but.. could you not like, charge it with some chaff unit of 10 guardians to absorb an overwatch and then a wraithlord or wraithknight to just hold them up and slowly kill them while you table the rest of his force with guns?

or something to that effect

smee wrote:
I'm not an eldar player or a tau player so this may sound stupid, but.. could you not like, charge it with some chaff unit of 10 guardians to absorb an overwatch and then a wraithlord or wraithknight to just hold them up and slowly kill them while you table the rest of his force with guns?

or something to that effect

It has hit and run.

+1 to using W.guard with flamers in serpents.

Casting powers on units that have arrived from reserve needs (another) FAQ. Building a super cheese unit around this is very bad form.