You want to aim for these skills, but the order you slot them is totally a personal preference. All the skills we are using are really easy to get to, and some of them we are slotting it just to make use of their passives.
Sap Essence: Drain Power morph: Class Section – Siphoning Skill Line. This is a massive aoe spammable. This does a ton of magic damage and heals you and your allies. The heal is stronger per enemy hit. This also gives major brutality and sorcery which increasing your weapon and spell damage by 20 percent. Spam this in AOE mob Fights.
Swallow Soul: Strife Morph: Class Section – Siphoning Skill Line. This is a great single target spammable and your main one against bosses. This does magic damage and heals you as well.
Inner Light: Mage light morph; Guild Section – Mages Guild. This is a skill you never activate you only have it on the bar to give you a 5 percent increase in max Magicka and major prophecy increasing your spell critical rating by 2629.
Impale: Assassin’s blade morph: Class Section – Assassination Skill Line. This is your single target execute spammable. When the target is below 25 percent health you use this. This does insane damage and is ranged as well.
Twisting Path: Path of Darkness Morph: Class Section – Shadow Skill Line. This is an aoe damage effect that does loads of damage. You lay this down in every fight. It also gives major expedition to you and your teammates making you fast. It is a little hard to see the effect so it takes practice using this.
Soul Harvest (Ultimate) – Death Stroke morph: Class Section – Assassination Skill Line. This is your main ultimate that has super low cost. I use this morph because I like the slotted effect of any time you kill an enemy you gain ultimate. This is fantastic. But essentially you want to use this whenever it is up and before you do your main damaging and spammable attacks because it increases the damage against the enemies by 20 percent for 6 seconds.
Unstable Wall of Elements: Wall of Elements morph. Weapon section, Destruction Staff tree. This will give more overall damage output, cast it whenever it is off cooldown.
Siphoning Attacks: Siphoning Strikes Morph. Class Section – Siphoning. This skill is going to give you Magicka a health back when you light and heavy attack. This is a crucial part of your sustain as a Nightblade. As long as you are light attacking you will keep getting resources back.
Merciless Resolve: Grim Focus Morph. Class Section – Assassination. This skill is going to again be a buff that you pop and leave up for 40 seconds. This will increase your critical damage and healing by up to 10 percent after 5 light attacks or a combination of light and heavy attacks. This is a mvp skills you should always have up. We are running thief mundus because we have this skill on our bar. You can fire the bow if you would like to but it isn’t necessary.
Dark Shade: Summon Shade Morph. Class Section – Shadow. This is another pop the skill and let it do it’s thing. This will make a clone of you that will do magic damage, and occasionally do aoe magic damage. This will also inflict minor maim, reducing the enemy’s damage done by 5 percent for 4 seconds.
Destructive Reach: Destructive Touch Morph. Weapon Section – Destruction staff line. This will do some massive flame damage and inflict the enemy with a burning status effect. This can be switched out for other skills but I like using it.
Soul Tether (Ultimate): Soul Shred Morph: Class Section, Siphoning Tree. This does a ton of damage, and heals you as well. Allies can activate the synergy and get some damage and healing as well. I love this for when you are in a big mob of enemies and you pop this and get all your health back and do solid damage as well.
This build again is a template and you can use what you like from it. But some alternate skills that you can use is you can switch out swallow soul with force pulse from the destruction staff line. This will be good in aoe fights, and it has way more range that sap essence does. You can switch out the soul harvest ultimate for the mages guild ultimate shooting star or the destruction staff ultimate elemental rage, but that is your preference.
Weapon: All Destruction Staff Passives
Armor: All Light Armor Passives
Guild: Magicka Controller Passives, Both Undaunted Passives.
Class: All Class Passives
Craft: Medicinal Use from the Alchemy Tree
Racial: All Racial Passives
Racial: All Racial Passives