Siding with Kahga initially or uncovering the shadow druid plot and joining them definitely seem like either unfinished (waiting for full release) or cut content. I would be very disappointed if the final version of the druid/tiefling conflict is what we have right now. Last I checked if you insist on helping Kahga, you fight and kill Zevlor and it just kinda....ends. I know that there is a resolution to this quest where Kahga initiates the rite of thorns and the grove is blocked off, but I'm not really sure how you are supposed to 'get' that conclusion aside from manually murdering each and every Tiefling since they don't react to Zevlor's early death in any way.
Not gonna lie, I found the whole Tiefling/Druid conflict very unsatisfying to play through as an evil Player Character-there just doesn't seem to be any real quest infrastructure supporting that option right now, and it doesn't help that although you are presented with the option of helping Kahga, the game clearly doesn't want you to actually follow up on it, since it's essentially a dead end and basically sabotages your efforts if you go through with it since you lose access to the other grove resources/merchants/quests/etc (and even Kahga herself basically says she won't reward you for it).
Uncovering the Shadow Druid plot only to be hit with 'invitation only, and you aren't invited' when you offer your support was a real sucker punch though. you don't even get the option to just leave and let the shadow druids sort things out, you just have the awkward option to pivot from offering to help the evil druids to debating Kahga to turn away on moral grounds(or not) and then combat.
This quest is *extremely* railroady. Can't imagine the frustration trying to roleplay an evil druid yourself through this.
