Depends what you're facing is what you'd want to do. Heavy incinerator on a dreadknight is a very strong choice and is worth it's points. GK have a very weak anti armor capability outside of melee sadly.
As far as psychic powers go, toss the book on your librarian to give him another roll on Santic, roll that first, then roll the rest. Psychic is very situational. If you're facing a lot of 4+ armor models or hordes (Tau, Nids, Orks, Mechanicum etc.) then spamming Santic for cleansing flame is a good bet for a deepstriking librarian. You'll be leaving holes in the opponents lines where he lands. If you're facing tank lines, or heavy hitting units with a lot of pie plates, invisibility is definitely one to go for in general.
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