* Dealing with the Slayers... I actually thought you'd end up hunted by the Order in DKS. Other than a couple rejects at Orobas's Castle, you really don't see much of the Order at all. I think there needs to be some aspect of trying to deal with them, somehow.
* Restoration of the Dragon Knights. You are the last Dragon Knight. Presumably you will die someday, leaving the world with no Dragon Knights. The Dragon Knights, though, don't seem like they are forever doomed - there's still true Dragons, somewhere (you meet one in Orobas Fjords), so presumably they could create more, should they choose to. I think, however, that they are probably wise enough to decide that if humans want to kill off the Dragon Knights, it's probably not the right time to create more. The other possibility is, if Maxos returns, he could create new Dragon Knights.
i was thinking along the same lines. Maybe with the help of the Patriarch or Maxos, to start a new order of Dragon Knights. after all, if it's just you against a Chaos-Incarnate- the odds aren't good.
In regards to the Slayers, i was thinking that as you try to convince the remaining Slayers, you discover the unpleasant truth of the Slayers- they were created by Damain loyals to hunt down dragons to ensure his victory and using the "Betrayers" rumor to keep Dragons out of the people's favor.
to earn the trust of the Slayers, you have to find someway to save Rhodes after her unfortunate run in with Bellegar in FoV.
Companions in Divinity III would just make it seem like Dragon Age wannabe. in most cases, i didn't need to summon my Creature or a Demon. in some missions, companions could be helpful like in Sassan's case- she helped you storm the Battle Tower, but only for so long.
i know it's probably cliched, but what about a morality-meter? With good actions/deeds, the people of
Albion Rivellon trust you- prices are reduced, locale Alchemists and Smiths don't use as much materials, rewards for quests are greater, mindreading costs less, etc.
With bad actions/deeds (like helping bandits), mindreading costs more- as people don't want a evil dragon getting into their head; shops sell less and of poorer quality- as they don't want you to kill them over their better gear.
I agree with the idea of "charm removal at a cost" and "upgrading pre-existing enchantments"
along those lines, Charms can be 'stacked' but to an extent that you can't quad-stack four Divine charms on something- and they have to be of the same boost: no stacking strength over spirit.
for instance- the Lesser +1 charms you can quad stack (effectively turning four Lesser charms into a Blessed); Minor +2 charms can be triple stacked; Major +3 charms can be double stacked; Blessed +4 charms can only stack with a single Lesser or Minor; and Divine +5 charms can only be stacked with a single Lesser charm.
effectively turning most charm options into a +6 boost.
along the same train of thought- Stripping charms from equipment does do just that- it strips the weapon/armor down to it's basic equivalent- a Heroic Knights' Heavy Guard Cuirass of the Plague just becomes a basic Heavy Guard Cuirass, just so you get your charms back.
you're gonna sell the gear your not using for a pitiful sum anyway- why not give them a pitiful piece of gear to buy off you?
There should be an alchemist/enchanter who can combine your charms but only to a Divine rank, and only if they're not attached to anything.
and your Battle Tower enchanter/alchemist, with specific (not to mention as rare as Malachite gems) items can combine Divine level charms- but only to an extent: Strength/Conditioned Body, Intelligence/Indominable Spirit, Dexterity/Heightened Reflex, Vitality/Spirit, Strength/Vitality, Intelligence/Spirit, etc...
finally, like Upgrading pre-existing equipment enchantments- if you disenchant them, you have a chance to get some of the ingredients back. only based on the enchanter's skill determines what and how much you could get back.
Lastly- combat abilities to guard or block with weapons, a chance to counter attack (instead of those "Retaliation" enchancements), and in some rare cases- and the ability to deflect magic attacks back.