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Yesterday, the tournament game ended with 15 levels completed. The game took a bit longer than expected.
Keep in mind that, for example, when reaching levels 9-14, you don't need to invest points in anything; instead, you can save them all and invest them at level 15 in powerful skills that become available at that level.
Accordingly, you can level up "Siege Master" right before storming a castle, using the saved points, if the game requires you to do so. This would be very justified. It would be good to see how the 3rd level of "Siege Master" works.
Endurance is a good skill. It's perfect for a warrior who's willing to sacrifice themselves. I usually take it for an Inferno warrior after I've maxed out all the necessary spells and combat skills at level 15. For Abyss Lords, it will increase their HP to 300.