Coastal Lands invader card

If Oceans are in play, and you Weave Together an Ocean with a Coastal Land, is the resulting joined land Coastal?
Yes, for all purposes.
A strict reading of the rules would say "only for Powers and Blight" (Ocean's Hungry Grasp) or "only for Blight removal/movement" (Scotland 5), because the joined land is not adjacent to itself, and "Coastal" means "adjacent to the Ocean". But that's super-wrong thematically, so it gets an exception-case.
Tags: Land Types, Ocean In Play (Ocean's Hungry Grasp), Kingdom of Scotland, Weave Together the Fabric of Place, 1 more...

What does the "Coastal" invader card do? Is it worse than the other Stage II cards?
It means that you Explore (and later Build and Ravage) in all Coastal lands on each board, 3 lands per board on the standard size.
If you are playing against an Adversary, the flag effect on the other Stage II cards is meant to make them approximately equal. Without an Adversary, this card is worse than the other Stage II cards.
(Discussion elsewhere) Tags: Explore, Flag Effect, Stage II escalation, Coastal Lands invader card, 0 more...

If Finder of Paths Unseen gets Presence in the Ocean, can it make lands Coastal?
Yes, if an Ocean with Finder's Presence is a land.
Whether a land is Coastal is defined by whether the land is adjacent to the Ocean. Open the Ways can create an adjacency between two of Finder's lands, allowing it to make lands (temporarily) Coastal.
Ocean's specification of "for Powers and Blight" makes this question really murky, but allowing it is much more thematic and fun, so that's the way the ruling is going. If it proves a problem later, it'll get changed then.
Tags: Open the Ways (Finder of Paths Unseen), Coastal Lands invader card, Ocean In Play (Ocean's Hungry Grasp), Finder of Paths Unseen, 1 more...