I guess i can't pick another class now
You could dual-class if they're human
It does help to read the manual, the level cap and how multiclassing works is detailed there
Something else, i realized i didn't pay attention to characters alignments and as a result, they're all True neutral ...
I hope it's not a problem, is it ?
Alignment does absolutely nothing past character creation, and the only thing it does there is that some classes can only be some alignments.
Is it normal for psionicists to get only 1 point for psionic powers on levelup from level 6 onwards? Until level 6 I always got 2 points to spend on psionic powers on levelup but now when my mul fighter/thief/psionicist reached level 6 as psionicist, I only get 1 point.
Different levels give 1 or 2, it's not random, it's set depending on the level, but yeah working as intended. There are many psionic bracelets in the game (many you can purchase) and they work somewhat like Preserver scrolls, they teach you the power if you don't have it, or they level it up if you do. I'm never really sure what the level of a psi power does, some clearly don't improve in any way, if others do I never really could figure out how.
Tried to kill the templar and his henchmen around the oasis, those morons wouldn't move and just shot eveyone but the gladiator to death, now, there's 3 waiting for me on the other side of the oasis and the gladiator has 3 leftover hp ...
Reload time, it seems.
There are other ways of dealing with the oasis templar
Like I mentioned previously, SL has tons of alternate solutions for almost every quest. I don't think we truly realized how exceptional that was when the game was new.
Also, either the gladiator has an insane amount of HP or multi-classing a warrior is a terrible move, the warrior/druid has half the gladiator's hp or so by now ^^'
As visions said Half-giants get double HP, and Gladiator gets the full 1d10 per level whereas multiclassed Fighters will always get less, so it's a monstrous combination for HP pool. But as for multiclassing, you're thinking in an inverted way: the point is to introduce the Fighter into everyone else's class so you can eliminate the class restrictions on armour and weapons.
I've played many parties with one half-giant gladiator and then multiclassing the other 3 in various combinations (always with Fighter in there though) to cover all my other needs. They're all very potent parties.
Also, reading gog forums, i feel like i should have taken metabolism path for the gladiator.
Psionic powers on non-Psionicists are pretty garbage so don't worry about it too much.
I'm wondering if i shouldn't restart with an optimised party now i know the ropes.
A tri-kreen warrior/thief would do wonders and i could dual the mage ranger, cleric or druid (or tri-class mage/ranger/druid) + tri-kreen psionic and a half giant gladiator (this one is too good)
Remember class restrictions if you're not multiclassing with a warrior, and remember the only 2 classes you REALLY need to not make the game stupid difficult is one Druid and one Preserver in one shape or the other. The game's not that hard and non-optimal parties will always work one way or the other as long as you have these 2 (and you can even make it work with just a cleric and no druid, though that's a bit harder). I'd say pick whatever you think is more fun and go with it, and don't be afraid to multiclass considering there's a level cap but no XP cap.