Hello people, I've not been able to find the answers to the folowing questions in the core-rule-book so here it is :

I think Librarian's are usually pictured without helm because it looks cool but... That makes me wonder if a Librarian could use his psychic powers wearing a helmet... I guess not but then, does it means Librarians can't benefit of protection to the head ? Does it mean they don't have the benefits of what Space Marine's helmet gives such as senses and so on ? Does it mean that Librarian's armors are not tight as to support the vacum of space ? etc. And if a Librarian Marine is wearing a psychic head gear, he can't wear a helmet right ?

I made this short on purpose because I guess you understand all the questions that this raises... Thanks in advance for your answers.

Older models but still:

I assume the helmet's form means that a psychic hood has been incorporated? I don't know. They certainly can use their powers wearing a helmet.

Alex

Aye, it's just the general 'no helmets for leaders' thing 40k has. Just take a look at Grey Knights, they're all Psykers and most of them wear helmets.

And for a more recent model, there's the Forge World model of the Red Scorpions' Chief Librarian, Sevrin Loth:

http://www.forgeworld.co.uk/Warhammer-40000/Space_Marines/Red_Scorpions/MAGISTER_SEVRIN_LOTH-CHIEF-LIBRARIAN-OF-THE-RED-SCORPIONS-WITH-HONOUR-GUARD.html

Yes, I thought about that : since they can send an astrotelepathic message from within a ship they must be able wearing a helmet too, BUT... The question remains about psychic hoods : Do they offfer the same protection as a helmet ? Do they offer senses and breathing apparatus like a regular helmet ? Are they airtight so as to support for example, the vacum of space ?

Obviously, just a Psychic Hood isn't going to be airtight or offer autosenses or something. But, as shown in the Grey Knight models and the Forgeworld model I linked, a Psychic Hood can be worn over a helmet.

Right, thanks ! And comparing my previous picture to the folowing (from your link) I notice a Librarian's helm is composed of 2 parts : the one shown inside the psychic hood on the first picture and a face mask containing senses, breathing, vox, etc. (you can see on the folowing picture from the top of his head and the cable near his ears) Cool, that answers my questions

Well, that Librarian is also wearing Mk 4 armor, iirc. So his helmets going to look a little weird in comparison.

Makes perfect sense that a Librarian should be able to use his powers with/without his helmet on. In no way does it affect him unless he choose to use his Belcher's gland to spit with his helmet on(that'd be very nasty indeed). The Psychic hood does not replace breathing apparatus. IMHO.