The order you slot it is totally personal preference, just make sure you aim to get all of these skills.
Unstable Wall of Elements: Wall of Elements morph. Weapons section, Destruction Staff tree. Awesome AOE with great damage, keep it up all the time.
Summon Volatile Familiar: Summon Unstable Familiar morph. Class section, Daedric Summoning tree. This pet does shock damage and when you activate it, they will pulse and at the end it will stun enemies, it’s very useful for trash fights.
Inner Light: Magelight morph. Guild section, Mages guild tree. This will increase your max Magicka just by having it equipped, you don’t even have to use it. That’s why we are using it in both bars, it’s a good utility skill.
Destructive Clench: Destructive Touch Morph. Weapons section, Destruction Staff tree. This will be your spammable skill. Each type of staff you use has a different effect, and since we are using a Lightning Staff, this skill will be an AOE spammable, great for every situation.
Crystal Fragments: Crystal Shard morph. Class section, Dark Magic tree. This will be kinda of a spammable for you, but only use it when it procs. When you use any skill that cost magicka, you have a chance of activating this skill, making the cast instant and doing more damage.
Elemental Rage (Ultimate): Elemental Storm morph. Weapons section, Destruction Staff tree. Besides this ult just being so pretty and cool to use, it is an awesome AOE ultimate with lots of damage.
Lightning Flood: Lightning Splash morph. Class section, Storm Calling tree. This will create a pool of lightning on the ground, and also provide a synergy your allies can use to do even more shock damage, keep this up all the time.
Boundless Storm: Lightning Form morph. Class section, Storm Calling tree. This skill turns you into lightning, it’s beautiful and also very useful, it ticks any enemy and comes close to you and also gives you some damage mitigation. It goes very well with Critical Surge, because the ticks also can do critical damage.
Critical Surge: Surge morph. Class section, Storm Calling tree. One of the best sorcerer skills, it will increase your critical damage, give you Major Brutality and also heal you everytime you deal critical damage.
Energy Overload (Ultimate): Overload morph. Class section, Shadow tree.You can switch this ult if you like, but it keeps the RP factor with Yennefer and also it’s really fun to use. Every time you light attack while this ult is active, the attack will be way stronger than it is. It costs 21 ultime per light attack, so the more ultimate you have, the more you can use it. Also you can activate or deactivate this ultimate with no cost anytime.
Class: All Dark Magic passives. All Daedric Summoning passives. All Storm Calling passives.
Weapon: All Destruction Staff passives.
Guild: All Undaunted passives. Banish the Wicked from Fighters Guild. Magicka Controller passives from Mages Guild.
Armor: All Light Armor passives.
Racial: All Breton passives.
Craft: Medicinal Use from the Alchemy tree.