Stop; obviously not for you.
Good to know.
combat is challenging and varied
No, it's not. Advertising otherwise is simply misleading and damaging, not only to the player who wastes his time, but to other modules as well that better deserve the endorsement.
The Aielund saga is for heroes, not for villains.
"Alignments = Any. Includes alignment mods based on dialog reponses."if the Cloak of Displacement is ruining the game for you, don't use it.
Expecting the player to behave completely and utterly illogically by default (and balancing around that) is hardly good design, as opposed to assuming the average nwn module player has IQ > 90.
Also, if the game is too easy for you, try a harder difficulty level.
Won't do any good if the encounters are fundamentally flawed.
Here's an example. Farloch's assassin's guild is hyped to be a tough fight, to a point where a supposedly funny NPC even taunts about it, even though the painfully aware player is, at this point, expecting it to be just another lawnmower exercise due to repeating bad encounter design.
Inside you find a level 7 sorcerer, with 16 charisma, spell focus: evocation, AC 17, wielding an unenchanted dagger (1d4) with an AB of +3.
He has one 1x magic missile, 1x melf's acid arrow, 1x lightning bolt, 1x iron horn + a scroll of globe of invulnerability. He goes to melee combat after casting spells.
At this point, the PC has level 5 or 6 spells, spell resistance 12 or 18 (25-55% chance to resist his spells even without a saving throw), AC into 40s. Even a single cast of protection from elements (available to all casters at this point) is enough to nullify his entire offensive arsenal entirely. The PC is very likely to have at least 5 lightning DR, and fighter/cleric types to have 5 magic DR. If the PC targets the caster first, he's going to have ~90% hit rate with any combat oriented class.
What you basically end up with is a single attack per round with AB 3 vs. AC 30-40 + 50% concealment for 1d4 damage, from a ~mid level spellcaster.
That's not challenging and varied combat. That would be a single well made sorcerer with intelligent AI using improved expertise to break the Aielund formula of auto-attacking trash mobs x10.