Playstyle & Rotation
The Playstyle for Necro Paladin with double Legendary is basically the same as always. You want to follow some Priorities:
Use your Holy Shock on Cooldown. You rarely want to sit on 2 Charges of your Vanquisher's Hammer. This only happens if you know there is a big AoE Healing incoming that you need to Bank for, but outside of that, try to use your charges; It also gives 1 Holy Power.
It's important to note that your next Word of Glory casts Light of Dawn while you have your Vanquisher's Hammer Buff (with Unity/Covenant Legendary 2 Stacks). AND it stacks with your tier set thus this massive output of healing is paired well with Beacon of Virtue. This means that timing your healing properly is essential to achieving great and consistent output and planning what you do in advance will help you massively
Healing doesn’t have a rotation and it is important to be flexible in whatever endgame content you find yourself in but here are some guidelines to follow:
Be sure to keep Holy Shock on cooldown and to use Infusion of Light procs if you’re using the caster build with Inflorescence of the sunwell. Otherwise, you’ll rarely use a casted heal in a raid encounter as the most efficient way to heal is to use Crusader Strike to reset the cooldown of your Holy Shock and spend the majority of your holy power on Light of Dawn unless you want to proc your tier set with Word of Glory.
Prioritise using Hammer of Wrath during Avenging Wrath over Crusader Strike. Whilst outside of your cooldown window, sniping low health adds with Hammer of Wrath will improve your Holy power generation.
Use Light of the Martyr sparingly (if you’re not using Maraad’s Dying Breath) . It should be used whilst you’re on the move if you have no other instant cast spells available to you in that moment of movement. Whilst using Maraad’s Dying Breath, it is your go-to button to press for spot healing and completely replaces Word of Glory as your main triage healing ability.
If you’re playing with Rule of Law, you want to use it mainly when casting Light of Dawn to minimise its potential wastage (if your raid isn’t stacked) or when the raid is spread over a large distance.
Beacon of Light overhealing is a variant to keep an eye on. Your beacon is most valuable on a tank that will take the most consistent damage, like a Brewmaster Monk for example. Self-sustaining tanks like Blood death knights could cause your Beacon of Light to overheal more than usual.
In periods between raid damage on boss encounters, be sure to squeeze in damage with Consecration, Shield of the Righteous and the occasional Holy Shock just to sustain the Glimmer of Light debuff (if talented). This is a good habit to get into, as being AFK between raid damage events isn’t ideal for your group leader.