This is a slight spoiler in regards to character development, concerning two skills in which it is in my opinion really useless to invest to, due to the context of other game systems:
Spoiler
a) wisdom
Each rank in it grants additional 2% to your experience gains (doesnīt work retroactively).
Investing into this early may eventually grant you few more levels, but the investments also mean you have to cut the points from other skills.
It almost seems like devs put it in there as a trap for people who didnīt do the math, because it really isnīt worth it, iirc I came to the conclusion investing into wisdom actually penalizes players
.
b) mind reading
Using mind reading is definitely useful and itīs a fun feature, but investing skill points into making it cheaper is useless in the Ego Draconis portion of the game - experience from enemies scales based on the level your character kills them at (say, killing a level 9 enemy with a level 6 char gives you 1000xp, killing the same enemy with a level 8 char gives you only 800xp) and mind reading in ED is not expensive enough to offset this. Not investing into it may seem like loosing uncomfortable amount of xp points at first, but iirc pretty much the only actual effect is that youīll be 1 level behind at some parts of the game (but, again, with more skill points at the disposal of other skills).
In the expansion mind reading costs were dramatically increased, but that part of the game also features respawn zones which may be used to offset it - which isnīt worth it in my opinion, by that time youīll be swimming in skill points anyway
so investing some points into the skill (or even maxing it via respec) shouldnīt be detrimental by then.
Gear which adds to these skills is, of course, useful.