i would recommend having only one ranger
using sebille as a wizard is fine, especially if you want to use loremaster on her since elves get +1 loremaster as a racial bonus
fane works well as a shadow blade, i'd recommend spending one or two points on necro to get some lifesteal since healing will be an issue barring whatever poison spells you give your wizard. mosquito swarm and blood sucker both help in this regard too
is lohse going to be doing physical damage while using hydro to heal?
also keep in mind that, since the DE update, summons now receive a bonus from intelligence if i'm not mistaken, so you may want to use summoning on a character you plan to put int points into. it's not a requirement though
