Heyo! I've tested out and analyzed all the skill masteries on all classes and came to this conclusion of what skill masteries are good:
-Mage
1.Time Shift Mastery:This skill has a 3.5% chance at 10/10 to freeze weaker enemies.....FOREVER! (literally),but don't let the 3.5% chance make it seem underpowered because this actually procs often if you have the countdown of pain upgrade (the DoT upgrade)
Also please note that panicking or using frost bolt on enemies will cancel out the Time Shift's amazing freezing effect. Nekro,Samael,Clyde,Slag,Grimm,Dovabear,and Arcane Deary owners beware! Also Arcane Deary's Ring's proc doesn't disrupt Time Shift's freeze.
2.Gale Force Mastery:Tired of getting stunned then dying while you are waiting for your shield to be ready again? This is for you! This mastery at 10/10 gives a 4 second buff on using Gale Force that removes ANY debuffs (that includes stuns) every 0.4 seconds. At 10/10, this mastery has 10 ticks in it.
3.Lightning Strike Mastery: At 10/10,this mastery buffs your damage of Lightning Strike even further! (by 10% at 10/10). Here is how significant it is:So,you do 1300 damage on Lightning Strike,add the Empowered Bolt upgrade and now you deal 1495 damage.Add the Positive Surge upgrade and now you can do 3738 damage on critical hits. Now add the 10/10 Lightning Strike Mastery and now you deal 1645 damage on normal attack and 4112 damage on critical attack. That is some good damage.
4.Curse Mastery :Curse is an alright pvp skill and how can you make it a bit more effective? Make it reduce crit by 10% at 10/10! 10% is a significant amount and can be helpful to make it less likely that enemies like rouges will will get the upper hand. If PvP isn't your thing, its also good in elites (just for debuffs) and reducing the the elite enemies' critical chances by 10% makes it a bit easier to stop that one hit crit bs they always do.
-Warrior
1.Horn of Renew Mastery:This mastery makes tanks and your buddies even tankier!At 10/10,this buffs up the armor 4 x (insert caster's lvl here).So heres an example of how this works:So I am level 46 and I cast Horn of Renew with the 10/10 mastery. Me and my buddies now will get a 184 armor armor buff because 4(10/10 Horn of Renew Mastery) times 46(because I am the one who casted Horn of Renew and I am level 46). This will provide 224 armor at level 56.
2.Rally Cry Mastery:Like the Horn of Renew Mastery,this mastery scales towards your level as well! except instead of armor,its strength.At 10/10,this mastery gives you 1.25 strength per character level,though this skill only applies to you unless you use the Call to Arms upgrade to give this to your buddies too. So if you have the Call to Arms upgrade on Rally Cry and have the 10/10 Rally Cry Mastery,at level 46 this will give you and your buddies 58 strength and 70 strength at level 56.
3.Juggernaut Mastery:Juggernaut has the longest skill cool down in the game right now with a cool down of 45 seconds. With the 10/10 mastery,this will shave off 5 seconds of the cool down,making the cool down 40 seconds.
4.Axe Throw Mastery (if you don't do solo runs):This mastery makes sure that all the enemies focused on you instead of your buddies. At 10/10,this mastery provides a 5 second bleed and has a tick rate of 1 second and has a 100% chance per tick to taunt affected enemies.
-Rouge
1.Combat Medic Mastery:Tired of spamming those damn mana pots every second? This mastery finally eliminates that problem! At 10/10, this mastery gives 3.33 x character level back per health kit. So, if you are level 46 and you pick up one of these health kits, you will have 136 mana restored. Though if your buddy is level 25, he will get about 66 mana back.
2.Shadow Veil Mastery: At 10/10 this will have Shadow Veil provide you and your buddies 2.5 damage. This doesn't seem like much,but according to the damage passive skill,this gets amplified based on the bonus damage % you have and other damage modifiers that involve percentage (damage elixir,pet happiness,etc.).If you have 460% bonus damage, this will provide 11.5 damage,but if you also have an arcane pet that has a 15% happiness bonus, this will amp it up to 13.23,and if you also have 30% damage elixir, it will add 17.2 points of damage.
3.Shadow Piercer Mastery: Pair this up with Shadow Absorption and Leading Dagger, and you will be healed 45% of your health at most. How this works is that Shadow Piercer can hit 3 enemies with the Leading Dagger upgrade, and a 10/10 Shadow Piercer Mastery heals you for 5% of your health per each enemy you pierce through (I'm not sure if Rising Death upgrade also applies),healing a total of 15% of your health.Add in the Shadow Absorption upgrade and you will heal a huge chunk of your health. One more thing,the Rising Death upgrade works with this as well so you can get healed even more than 45%!
4.Razor Shield Mastery:Spacetime Studios released an upgrade for Client 1.5 that reduced the armor of rouges and now rouges are desperate to get some more armor and defense. This mastery helps because a 10/10 Razor Shield Mastery reduces damage by 10%,making rouges a bit tougher again like they used to be before the Client 1.5 update.
5.Noxious Bolt Mastery: Pair this with the Lingering Poison upgrade, and now the poison will last up to 10 seconds! Use the Fragmentation upgrade and now the poison does even more damage. At 10/10, this mastery increases the duration of the poison by 4 seconds and buffs its damage by 10%.
6.Shadow Storm Mastery: At 10/10 this mastery increases the impact radius by 2.5 meters and can hit 5 more targets so that u can do lotsa aoe.
Anyways thanks for looking at this post and I hope this helps making skill builds easier and also heres a video that I've made that talks about the same thing as well. well (I kinda stutter a lot and it's a bad habit lol): https://www.youtube.com/watch?v=JjTR2bjg2sE
I've also made a vid that talks about how to make a build out of skill masteries as well:https://www.youtube.com/watch?v=Th9YgRTj0Ic
How skill masteries progress:http://www.spacetimestudios.com/show...ion-per-Level&
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