I would take a guess at only from health restoring effect like champion point passives, or potions or skills , not so sure about HP regen , need to test it
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- Ishkashi - Magplar
- Orchish - Stamplar
- Amerikan Knight - Stam DK
- Déàth - Mag DK
- Psychic Venom - Mag NB
- Made in Quebec - Stam NB
- Death'inately not Dëäth - Stamden
AFAIK, it simply buffs healing taken/received by 30%, similar to other set bonuses, champion passives, Argonian racial passive, etc. Healing taken/received and health regen are two separate mechanics.
Gore-of-the-Forest Argonian Nightblade Wode Earthrender Breton Dragonknight Ceol the Last Baron Redguard Dragonknight Wayra High Elf Sorceress Erebain Salothran Dark Elf Templar Rituals-of-the-Forest Argonian Warden