As a title said. Templar need his sustain problems adressed.
I mean Rune that recover both stats magicka and stamina or something else. Templar is only class that have only one resource management at time. so if i choose stamina focused build i can only manage stamina and only stamina with my skills. Game force templars to build Wretched on every pvp build wchich is bad for balance and weaken templar.
To adress sustain problem is change few abilities:
Purge interaction - Before current dot metas purge was easier to manage, right now 1 cast of elemental sus ad 6 debuffs. And it's FREE OUT COST NO CHARGED ONLY TODAY.
Change how purge work give templars option to use they own synergy from purge and remove purge on cast and change ritual to be more versitile in movement make it just aura similar to Saint's & Seducers mythic.
Second option how purge can work : It's purge on cast 5-6 effects and have constant purge every 2 - 3 seconds 2 -3 effects purge for whole time. this way i won't waste magicka to recast on the ground healing every 3 second that last 32 seconds. Just look at hurricane ability from sorcerer Storm Calling skill tree it's best effect are on last seconds the of skill. People not recast it constant because it's waste of stamina.
Rune focus should regen both resources but weaker or different. Chanmge it's regen by 75% to 25% on Stamina morph we regen 4000k stamina and 1200 magicka and otherwise.
Restoring aura and Repentence both abilities are not complete. They just here without purpose.
Repentence is overall good concept but bad in practice combined with templar not existing damage and not enough resource back from this ability. It's just weak and useless. Change how this work maybe something like tether with living enemy or ally that restore you or ally resources and health /decrease enemy health and resources for 5-10seconds. Keep aura on this but active effect will be different and grant support mechanic and offense mechanic at the same time but you must choose what you will do at the moment.
Radiant aura make it aura that work always without active with range of Saint's Seducer mythic. Add new active buff/debuff.
Right now that's all i would add in active abilities. There can be some changes into passives on templar when it comes to sustain but right now im out of idea.