• Towers of Fury contain resources and neutral troops
Players do love resources, but the amount available will determine who shows up to claim/defend them. There must be enough available in order to justify the effort required.
• Jarls of a Kingdom where Towers of Fury appear can attack these locations or defend them by sending their reinforcements there
When you say Neutral Troops, how neutral are they? If these troops are killed, are there points awarded to the kingdom that kills them? Does there exist any additional rewards for their survival by defending them?
• Jarls from enemy Kingdoms can only attack Towers of Fury
Similar to above. Are event points awarded for killing the neutral troops? Will points be awarded to home kingdom for losing troops to neutral troops? How difficult will they be to kill?
• All Vikings will get Soul Shards for destroying neutral troops in Towers of Fury
This would lead me to believe they are entirely separate from the event. For example, destroying neutral troops is similar to destroying troops of players who recently moved to a kingdom and are not participating in the event (Bright Yellow).
Let's discuss which is more advantageous for a Kingdom where Towers of Fury appear: attacking them and taking their resources or defending them at all cost?
If the troops inside are completely neutral and only reward soul shards, then why defend them? Also, if there is no risk of points for the events, what is the fear of attempting to destroy them?
The neutral troops plus the option to attack/defend by the home kingdom makes me wonder if there is any purpose to defend? Unless more details were shared on what this all entails, or that I am missing something completely; it would appear that a smash & grab job for all the resources is the best strategy.