gunman_: I find Demonknight harder than Aec'Letec, because DK always uses dispell on my characters while Aec'Letec never dispelled my buffs. I'm pretty sure Aec'Letec do not use dispell magic in vanilla BG1.
You could be right on that one.
So, for an easy fight with Aec'Letec you must buff with Haste, Potions of invulnerability, Storm Giant Strength, Heroism, Bless etc, and most important, Potion of Mirrored Eyes because they do protect against Death Gaze. Send the most buffed tank near Aec'Letec to attract his attention while the others kill the cultist with arrows of detonation and spells. Then concentrate on Aec'Letec and he should be dead very fast.
I think potion of magic shielding or invulnerability also helps against death gaze and paralyzation, because they take effect only if the saving throw fails, but Potion of Mirrored Eyes grants 100% invulnerability. Just make sure to have several prepared in quick slots because they wear off quickly.
Ok, I've just checked the resources, and the Tanari Death Gaze is
not a petrification spell, which is what Mirrored Eyes protects from. In fact, Aec'Letec doesn't even have any spells or abilities, they are all unique, and all force applied via script. Checking the Tanari Death Gaze, it is classed as an innate ability, with no connection to petrification, so I do not see how a potion of mirrored eyes can help in any way whatsoever. I did notice one thing, which I wasn't aware of before; the death gaze can be saved against (paralyze/poison/death), but Potion of Mirrored Eyes is quite specific that it protects from Petrification only.