On page 25:
"A hero cannot have more than two upgrades, a level one and a level two upgrade, both from the same upgrade tree"
This sentence seems to say that a hero can only have at most 2 upgrades. They need to be a single level one and a single level two upgrade and they both have to be from the same tree. The image seems to suggest that only one tree can be upgraded but also contradicts the maximum of one single level two upgrade within the tree.
Which of the following images shows the correct way to maximize a hero?
2 maximum upgrades:
Can I upgrade only one tree?
(Maybe, this is the safest assumption)
3 maximum upgrades:
Can I upgrade both level two abilities in that single tree?
(doubtful, but the rules show this image)
4 maximum upgrades:
Can I upgrade both trees?
(Maybe, but the rules and image of the textbook are vague)
6 maximum upgrades:
Is a hero allowed to upgrade both level two abilities in both trees?
(doubtful, because this might be overpowered)