Guild skill tree

One point per member, plus holding bonuses. Experience and items are learning costs.

Basic Guild Skill Tree

0/50/50/30/50/20/30/50/20/10/10/10/10/30/30/30/50/50/50/10/10/1

Fortress Skill Tree

0/30/30/30/50/50/50/30/30/3

Special Guild Skill Tree

0/20/20/20/20/20/20/20/20/20/2