Invoker Witch10 / Harrower4 / ???

[Dogfax]

Hi Folks,
I am in a great game (Hell's Rebels) currently and am approaching level 15.
My setup is:-
Invoker Witch 10/Harrower 4
Money/magic items are tight/restricted (which is kinda nice for a change, having to make the most of what we can find), and some OP abilities are gone (Slumber Hex, Enervation, Black tenacles...) for balance purposes, which again is seems correct.

My question is, as I look to go to level 15 I have a choice of Witch 11, or Harrower 5... neither seem overly inviting TBH.
Witch is ok, but fun wise it is just spells/Hex... and I have all the Hexes I really want already.
Harrower 5 isnt floating my boat either...some of the later levels are ok, but again I have out of that prestige class what I wanted (love a good greater Harrowing in the evening!)

My Hex DC is ok at the moment (ref the invoker ability to boost it), so I can prob take a dip of a lev or 2 in something else, but what??

I looked at the Stargazer prestige class as it seem to have a few interesting abilities (even though some are demon focused) and allows Hex additions/boosting. As this isnt a core book I am not sure I will be allowed this anyway (waiting for DMs reply...), so failing this any suggestions? Doesnt need to be OP, just interesting TBH.

[avr]

For pure efficiency go back to witch; more hex save DC is good, and if you've been having trouble shopping then you likely will like getting spells for free each level again. Stargazer gets you hex save DC and possibly interesting class abilities, but do you even worship Pulura?

Other ideas - if thru some miracle you met the prereqs then Magaambyan arcanist might be fun.

[Dogfax]

hmmm the Pulura thing is an odd one as it isn't mentioned in D20.. is that a legal thing?
Magaambyan arcanist looks interesting, but as you guessed, I dont qualify...who wants to be good anyway ;-)