Help build a healer around a theme

I *really* like the thematic aspects of a Templar/Necromancer/Arcanist as a support; a master of life, death, and the unknown. I'd really appreciate some advice on which skill lines to subclass and which skills to take cause I'm awful at making my own builds and can't find any that use these 3 in particular. Also decent non-trial gear suggestions, preferably crafted and overland to start.

my current thoughts are to pickup living death (necro) and restoring light or aedric spear specifically for spear shards, then keeping curative runeforms.

for a few bits of extra info, I'm an arcanist base, cp~1360, and have a master crafter character. I'm also not expecting to be the top tier best healer/support ever, but still want to be effective without having lots of redundant skills (like rushed ceremony and render flesh both work really similarly so I know taking both isnt a good idea).