Ok, so at the moment we have Wind Runes powered from Natural energy, and Fire Runes powered from Unstable energy. Do people think there will eventually be Earth Runes powered from Stable energy? (Earth runes sounds a better fit for stable energy than air runes, the fourth traditional element).

If so, what do people think Earth Runes might affect?

As a starter, what about something that boosts melee damage (or defense) and which the Ulthuk could make a lot of use of, to make them fearsome in combat? How about an exhaustable skill - a sort of blood rage - that increases threat for an attack?

Would there be any issues making this available to all factions. or would it unbalance things?

Any thoughts?

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Air and wind are the same ?. I think we'll probably see water/earth down the pipes. Earth runes may affect defense, water maybe collisions?

Water could be a healing mechanic since usually when you see the 4 elements in a game its the one that has healing powers.
As of right now it would be rather limited since only 6 models even have multiple wounds, and letting it bring back dead models would be kinda extreme.
Water Rune: Skill: Exhaust this card and remove 1 wound from each friendly unit at range 1-[Nature Runes]. 6pts Equipment

Earth Rune could be two things: either literally Rune Golem's ability (+1-2 armor) or a spell shield, which prevents the next 1-2 Banes or abilities that work off Runes from working.

They might stick to the 4 classic elements, but they don't have to. I think runes could represent any type of magic if they really wanted to.