Geomantic sorcerer: please suggest me some true disadvantages

The geomantic sorcerer kit found here: 

https://www.gibberlings3.net/mods/kits/geomantic/

is cool but the penalties are not that great



Disadvantages:
- Has a 15% penalty to experience.
- Strength, Constitution, and Dexterity have a -2 penalty.
- Has a penalty of 1 to casting speed.

Requirements:
- 13 Wisdom, 9 Charisma.
- Must be of any Neutral alignment.

Restrictions:
- Sorcerer Item usage.
- Recognized as a sorcerer.


The disadvantages are cheesy
- xp penalty is irrilevant in the grand scheme of things,
-  the STR, const and DEX are useless for a sorcerer,
- the penalty to casting speed is not that important either because you can offset that easily with so many items

The requirements are also silly...


So, I was wondering: I removed all the disadvantages above and now I would like to add true disadvantages to someone that is actually linked to nature (geomantic sorcerer has druidic spells too).
So, what should I add as a disadvantage? I'm not that good on balancing, so I'm actually curious for flavourful stuff if possible.