what was she driving to make her authority so unquestioned and how fast was it , did she do some sick wheelies ?
All the high priests and priestesses of Manann across the entire Old World as well as some of the lower ranked ones got visions which generally depicted her coming from the sea itself to put things right. Which is exactly what happened. Some saw a storm who's thunder boomed with her voice coming as a moving maelstrom that ripped up a forest of rotten trees along the beach. Others saw lightning explode tainted sea-life that was diseased and consuming each other while cleansing waters from the tide washed the tainted meat and bone pieces away to be cleansed over a thousand year of water currents. Some saw a faceless woman on a ship made of water crashing through icebergs filled with pus and rot and other unspeakable fluids that had been filling up the harbor.
So on and so forth.
Then she did show up, and the first thing she did was strike down all of the previous High Patriarch's guards with Manann's divine lore, forcing them to drown standing up as their own organs were crushed by deepsea pressure inside their skin and blood spewed from their orifices. She grabbed the High Patriarch who's corruption and failures of inaction and inattention, and ripped from him all divine authority which very clearly was shown to everyone in the Cathedral and the streets of Marienburg as she dragged him along without him able to offer any resistance to her at all, whether physical or divine with his own prayers guttering out like weak whispers, and then took him to the water.
And then she drowned him in the water, seaweed cord ropes wrapped around his neck.
Do you know how fucked you have to be as a major Manann priest to
drown?
After that she got up, and set to work immediately, and all the staff of the main centerpoint of the Cult of Manann upon which the international Cult spins about universally acknowledged her thanks to their own visions and signs from Manann. Full bore. A flight of albatrosses flew over the city for days before she arrived, and when the High Patriarch sought to call to them - this divine bird of his God - they flew to him and then dropped dead all around him. The worst possible omen for Manann's faithful.
Many priests received the vision of the drowning man, universally considered to be a sign from Manann of dire warning speaking of needing to change one's ways, especially if the priest is the one doing the drowning.
And the one doing the drowning was the High Patriarch. Repeatedly.
And then Magdha came and drowned him. She was the storm that was approaching, the tide that was coming in, the rocks of the waters that destroyed the ships overburdened with corruption, the albatross who bit off the throat of the protestor, the purified ship sailing in, and more.
She's the most powerful and favored Manannite in a long, long time, born by the most faithful, raised by them, of them, for them, and drinks seawater and has never touched bare land, even now, thanks to her armor and all that. She's not something or someone that comes around except every few generation.
That's how pissed off Manann was that he threw her at the problem.
I would also imagine that "Break sea ice to clear a path for a ship" would be something Miracles of Manann could accomplish.
Undoubtedly, though it might be something that the Kislevites specialize in more than others elsewhere.
How is the medical/scientific part of Kislev reacting to the info twins brought? Outside of being too busy or dead to actually/properly care or discuss it?(Imagine; they decided to spread it in time of peace) Since Kislev is far less peeved with undead and necromany, are they more leanient in general, or is it the case of Morr not being that much off a deal to actually get upset over bodly 'desecrations' like that?
I'm not going to tell you about stuff that hasn't happened.
