This is a build by Deltia's Gaming
Build = https://deltiasgaming.com/builds/eso-stamina-nightblade-pvp-build/

PLAY AT VAMPIRE STAGE 3!
Food = Bewitched Sugar Skulls
Potions = Essence of Health (tri-stat = aka restores health, magicka and stamina)
To improve on the build you can gold the gear and max out the passives in the CP tree's.

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Skill Set 1 Front Bar
Merciless Resolve – Maintain this buff at all costs as it increases your weapon damage for each stack. You can also proc the 5-stack shot and fully-charge heavy attack from stealth to proc a “follow-up” 10% extra damage from the two-handed and fire it off. This will essentially nuke a player not even using an ultimate. Moreover, you want to be in range for the extra healing benefit.

Power Extraction – Gives major buff and minor buff so it’s actually better than rally. Only downside is you will have to heal yourself purely from the back bar.

Camouflaged Hunter – Slotting this skill gives us increase critical chance, weapon damage and ultimate on kills via Fighters Guild passives. Moreover, it’s a great counter gank if you activate it going against another nightblade. Consider this your flex spot if you want a gap closer or something else.

Surprise Attack – Stamina main spammable that can be replaced with Concealed Weapon if you can sustain magicka.

Whirling Blades – Flex skill but big AoE kills. Killer Blades better for single target kill.

Incapacitating Strike – Single target nuke combined with fully charge from heavy attack still works well. Switch to Dawnbreaker if you want more AoE.

Back Bar
Leeching Strikes – Sustain tool keep up at all times. When active each light and heavy attack gives back stamina. Consider this your flex for bow ability or stun.

Magnum Shot – Used as our stunning tool that can be followed up with hard-hitting Incap ult.

Shadowy Disguise – Land a crit at will and stealth away. Take the other morph if you want no cloak but better healing.

Healthy Offering – amazing burst heal combined with resolving vigor for great survivability.

Resolving Vigor – burst heal over time

Swarming Scion – Defensive ultimate that instantly heals you to full Health, provides AoE damage and you additionally heal for 15% of all damage you deal.