a cool gimmick for a caster

[Nelith]

http://www.d20pfsrd.com/magic/spellblights#TOC-Hemoculysis

Can a caster get this on purpose somehow ?

[johnlocke90]

Sure, cast prediction of failure on yourself until you get it.
http://www.d20pfsrd.com/magic/all-spells/p/prediction-of-failure

[Joegoat]

Yeah... or, a spell thats not 8th level and wouldn't cause you to be permanently shaken and sickened but could still gain you this particular spellblight is bestow curse, and since youre casting it on yourself you can choose what affliction to give so you wouldnt have to cast it multiple times.