Brennan is very good at using NPCs to support PC development, choices, and story. Hannan (rip) is a great example.
First, Brennan uses Hannan as an antagonistic force toward the Seekers; he unifies them by standing against both Occtis and Vaelus. He also provides contrast to the more measured and peaceful Druids we've seen thus far. He provides a counterpoint to Vaelus, the only other Elf we've seen in the campaign, and forces her to reveal more about her position regarding the Shaper's War by defending it.
As his relationship with Vaelus develops, we get more nuanced glimpses of what Elvish life is actually like, the full weight of Sylandri's hold of her creations, and Vaelus admits who she actual has been missing and grieving all these years; not Sylandri, but her family. Admitting this lets us understand the sacrifice she makes when she chooses to put her family aside, to break the Stone of Nightsong and help the Rungjani dead find peace.
And of course, when Hannan learns of Mara's capture he flies to Obrimus Manor to help her. There, he does not barge in to search, instead he starts to counter the Undead. This is extremely important support for Thimble. The magical darkness dissipates, her search difficulty decreases significantly, and the undead threat is lessened greatly. I feel confident in saying that Thimble would not have succeeded without this intervention, but critically, he supports Thimble's success without swooping in to make it his own.
With this support, she is able to finish off the Undead Monstrosity that was Raimond Davinos. Now Teor's death is not in vain because she heroically finished the work he had started. Together, they rid the world of a great evil while freeing Raimond's spirit and recovering his blade.
Thimble is able to recover the Pridesires. Their spirits and bodies cannot be harnessed by the Tachonises. She recovers the Royce Bracers and the Einfassen ax, which could have complicated things had they been discovered in the crypt. She also finds valuable information throughout her search, learning where the Gnomish statues were taken and information on the tenebral ship. Hannan facilitates all of this as he holds the darkness and the dead at bay.
The last important thing Hannan does is to die.
And this is very important, narratively.
Primus Tachonis has been bested by the work of the Magpies. We've seen him threatened by the Einfasen and condescended to by Yanessa Halovar. Why should we be threatened by him? Maybe he's just prideful and sloppy. Maybe he's careless and stupid. Maybe he's actually not that frightening.
And then he kills Hannan without a second thought, and we see the truth that Brennan has been nudging us toward since the beginning.
Primus is not stupid or short-sighted, he is panicking.
He knows things we do not. He knows something is coming, and the full wrath of the Druids that may come in a handful of months doesn't matter, because there are larger forces at play. So yes, the Einfasen and the Cormorays are deeply powerful and the Halovar's have power and influence as well as cunning and poise the others seem to lack.
Even so, Primus Tachonis is the most dangerous threat right now, because he is desperate. In his mind, he has nothing to lose. The murder of Hannan proves this.
Sometimes the cost of a great story is the loss of a great character.
Hannan filled his role well.
