Two terrain type ideas

[Casual User]

One thing we'd really need is a real sunken castle. Not a ruin but a merman castle.

The underwater canyon sounds great.

[Temuchin Khan]

-coral reel would be like hills for water units (same as kelp)

Coral Reef could be in some ways like hills, but I still think it should be impassable to non-true-flying units weak to pierce.

Also, I edited one of my posts at roughly the same time as you were replying to it, adding the idea of Sea Cave tiles.

[Sly]

-coral reel would be like hills for water units (same as kelp)

Coral Reef could be in some ways like hills, but I still think it should be impassable to non-true-flying units weak to pierce.

I don't like this part ... it's not a basic principle and so either it's not KISS or not very pertinent (damage resistances shouldn't imply anything else (and never any movement related thing)

[Eleazar]

I also like both these ideas.

Would it be possible to make a branch of the White Mage that was capable of "consecrating" a hex and making it Holy Ground?

The units have been intentionally limited to 3 kinds of actions.
1)movement
2)attacking adjacent enemys
3)effects they have on adjacent units just by standing there.

The point being that all you have to do is select a unit and click on a hex. It's KISS.

So the only way something like this could be included is if the Mage concecrated just by standing.

I don't see this being included in Wesnoth though, i can't imagine either:
1) Makeing "concecrated" versions of every terrain,
2) or applying important gameplay qualities to terrain that are invisible.