A few thoughts on tributary deployment across the Old World:
Reikland:
-Possible tributaries: Dreaming Wood (Safe-ish, may be hindered by the Aetheric Shunt), Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: No political roadblocks, the Emperor has already given us his full approval. Support from the Colleges readily available. No significant and active threats.
-Cons: Reikland is probably the province that needs waystone support the least, may be accused of playing favourites by the other provinces.
-Allies: The Emperor, the Colleges of Magic
-Threats: Forest Gribblies, Drachenfels?
Stirland & Sylvania:
-Possible tributaries: Water Spirit, Haléthan (requires Priest of Halétha)
-Pros: Home territory, support from Roswita and the Council of Manhorak, desperately requires any form of Dhar cleansing.
-Cons: Dangerous terrain, no active waystone network
-Allies: Roswita, Markgraf Nyklaus, Kasmir and the Bog Priests, Zhufbar
-Threats: Vampires, necromancers, undead.
Averland:
-Possible tributaries: Water Spirit, Haléthan (requires Priest of Halétha)
-Pros: Mostly open farmland.
-Cons: Low priority, safe-ish province, EC is madder than a box of hares.
-Allies: None
-Threats: Greenskins, overly curious cattle, Averlanders
Wissenland:
-Possible tributaries: Water Spirit, Haléthan (requires Priest of Halétha)
-Pros: Mostly open farmland, soon to be very good friends with the Elector, home of the Elementallists.
-Cons: Elementalists, low priority province.
-Allies: Count Konstantin, maybe Elementalists?
-Threats: Skaven, Elementalists?
Talabecland:
-Possible tributaries: Dreaming Wood (Safe-ish), Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Heart of the Cult of Taal and Rhya
-Cons: Large province
-Allies: Longshanks, Royal Academy of Talabecland (collegiate branch)
-Threats: Forest Gribblies
Hochland:
-Possible tributaries: Dreaming Wood (Safe-ish), Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Smallest province, has it's own college of magic.
-Cons: Doesn't exist
-Allies: Hochland College of Magic
-Threats: Forest Gribblies
Ostermark:
-Possible tributaries: Dreaming Wood (Dangerous), Water Spirit, Haléthan
-Pros: Hedgewise, border with Kislev
-Cons: Forest of Shadows
-Allies: Ostermark Hedgewise
-Threats: Forest Gribblies, Forest of Shadows
Nordland:
-Possible tributaries: Dreaming Wood (Dangerous), Water Spirit, Haléthan
-Pros: Hedgewise
-Cons: Forest of Shadows, hostile towards Laurelorn and Middenland
-Allies: Nordland Hedgewise
-Threats: Forest Gribblies, Forest of Shadows
Ostland:
-Possible tributaries: Dreaming Wood (Dangerous), Water Spirit, Haléthan
-Pros: Hedgewise
-Cons: Forest of Shadows
-Allies: Ostland Hedgewise
-Threats: Forest Gribblies, Forest of Shadows
Middenland
-Possible tributaries: Dreaming Wood (Dangerous), Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Allied to Laurelorn, no political roadblocks, full support of EC and Ar-Ulric
-Cons: Dangerous terrain, conflict within the Cult of Ulric
-Allies: Cult of Ulric, Alchemists Guild
-Threats: Forest Gribblies
Moot
-Possible tributaries: Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Friendly and practical, open farmland
-Cons: Border with Sylvania
-Allies: Hafling Cults, Elder Hisme, K8P Halfling community
-Threats: Undead, Stirlanders
Kislev
-Possible tributaries: Dreaming Wood (Dangerous, Shirokij only), Water Spirit, Haléthan (Requires Priest of Halétha, except within the Shirokij)
-Pros: Full support of the Tzarevich, two well established magic traditions
-Cons: Dangerous terrain, Praag, Troll Country, Winter
-Allies: Boris, Ice Witches, Hag Witches
-Threats: Trolls, Chaos, Demons, Kurgan, Norscans, Winter, Vampires?
Karaz Ankor
-Possible tributaries: Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Full support of Karak Eight Peaks and Karak Azul
-Cons: Unlikely to trust human and elf magics, needs a runic tributary
-Allies: Karak Eight Peaks, Karak Azul, Runesmiths Guild
-Threats: Mountain Gribblies, Greenskins, Skaven.
Bretonnia
-Possible tributaries: Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Damsels, Fey Enchantress
-Cons: Not yet recruited or mapped, Asrai?
-Allies: Carcassonne
-Threats: Forest Gribblies, Mountain Gribblies, Iron Orcs, Undead, Asrai?
Estalia/Tilea
-Possible tributaries: Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: One of the few exits out of the Old World for the Waystone Network
-Cons: Not mapped, no contacts, not unified and no central authority
-Allies: ???
-Threats: Gribblies, Skaven
Border Princes
-Possible tributaries: Water Spirit, Haléthan (Requires Priest of Halétha)
-Pros: Once a link in the waystone network between Ulthuan and the Karaz Ankor
-Cons: not unified and no central authority, Greenskins everywhere, who even cares about this place?
-Allies: Karak Eight Peaks, Barak Varr, Mad Dog Pass
-Threats: Gribblies, Skaven, Greenskins, Bandits, Border Princes