Max all abilities:
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Successfully complete the indicated task to max out the corresponding
ability. Max out all abilities to get the „Jack Of All Trades” trophy.
*Note: * Each ability has 11 upgrade levels. You can view the progress of
each ability by selecting „My Career”, then „Abilities” at the at
multiplayer menu.
Dark Souls reference:
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When the game first begins, look on the walls to find a poster for „Dark
Trolls” that features the main character from /Dark Souls/ being chased
by a large troll.