WarKirby
Arty person
I think one turn is fine. It's easily enough for the dumb AI to counterattack and wipe out your unit, I doubt it's a problem for a human player either.
Perhaps all sidar should have some protection from death damage in general ? though not 100%..
invisibility within borders for all units, I think it would suit.
But death magic goes against everything Arawn stands for! The Sidar abhor necromancy, and so should definitely not start with death mana, unless maybe you gave them a seperate set of promotions/spells for death, the way the scions get Corpus promotions for Body.
Would it be too much if the Sidar racial promotion had a small chance to randomly grant Hidden? Some of the pedia entries seem to imply that the Sidar don't have full control of their invisibility and that they can have trouble getting people (including their friends and family) to notice them when they want to be seen.
I see no reason to give the Sidar such a bonus vs Melee, or to make them weaker to animals.
I guess some resistance to death damage could be ok, but I tend to think that immunity to first strikes and to the marksman promotion might be more appropriate.
Invisible units are visible in cities so the enemy can't just walk in