6th ed. psykic power questions

[Satric the 5th]

got a few questions about 6th ed. psykic powers.

1. Powers that are labeled type "blessing" do they work the same way as WFB where they stay in play till dispelled? If so, how does one dispel one of these powers, do you just use a warp token? And at what range does this happen or is it a battlefield effect?

2. Also type "blessing" powers, can you cast them on more then one unit, if cast in different turns? And have both stay in effect.

3. Does psykic hoods have any affect on type "blessing" powers, if they came into play outside the 6" range? i.e. do they come into play if trying to dispel a existing power?

[Bean]

Unless stated otherwise, Blessings and Maledictions last till the end of the turn after they were cast.

All a Psychic Hood does is let a Psyker replace your Deny the Witch roll bonuses with his own, if he's close enough. However, Deny the Witch only works to prevent powers that target an enemy unit--so neither deny the witch nor (by extension) a Psychic Hood do anything against Blessings.