Add Endurance skill under Vitality Attribute

[CBroz1]

Few other games let you build a character around constitution or fortitude.

1. Could we add a skill here?
2. Just for skill checks? Could a build focus on this skill as a 'primary skill' with which one would attack?
3. Concept: A poison AOE attacker focus less on direct hits and damage over time (inspired by this concept) or causing the poison status effect

Previous thoughts

1. As Vitality score is tied to max HP, we worried that we could place too much importance on this Attribute to put more there.
2. Keeping damage values low with a default of 1 makes it harder to do damage over time mechanics.

(based on feedback from @BDBott)

[LockerM]

I like the idea to add an additional skill below it, and I think we can consider this when re-evaluating our skills list to potentially re-institute the additional 2-3 skills under each Attribute.

For now I think we have enough to test that adding in new Skills still feels far away.

Vitality overall is primarily designed to give people more HP, though we can also use it for some key Checks, like running for a long time or swimming, holding breath, climbing a mountain, etc. I think it already has potential as an Attribute first that I don't know what Skill we would add underneath it that would be urgent when the Attribute still has so much we can do with it.

Separately, I love the idea of a poison AOE attacker that uses the new Poison mechanic I suggested in Issue #73 - found here. Then this is a character who is draining stamina more than HP, and could scale nicely if it allows a Player to try and drain cards from an Enemy Dealer - but also as a great GM mechanic and Powers List that we could leverage for interesting fights that rely more on Stamina Drain than on Damage. Have the main core Poison Power force a contested Vitality Check, and make Poison a regular thing in Adventures and there's another really strong perk of the Vitality stat.