As a Wizard, I can cast Invulnerability (XGtE, p. 160) on myself, which states:
You are immune to all damage until the spell ends.
If I then cast Warding Bond, do I suffer the reflected damage when the warded creature takes damage?
Further information about my build:
I intend to go for a 3 cleric (tempest domain) / 17 wizard (abjuration).
High constitution / intelligence, heavy armored with a shield.
As spells, I'll use Bless and Warding Bond, with high-valued Arcane Ward (avoiding most of concentration checks) which I refill with Abjuration spells (absorb elements, shield, counterspell, banishment), and eventually a Chain Lightning with Destructive Wrath for a 240 damage spell once a day.
At last, I can use Mind Blank (level 8) to give immunity to physical damage to an ally (with concentration) and Invulnerability (level 9) to grant resistance to all damage to an ally with Warding Bond while being immune to that damage.
I can use Ability Score Improvements to easily max Constitution and Intelligence, along with Resilient, Armor Master (to reduce damage taken from warding) or War Caster and Shield Master feats if I'd find a giant belt to melee fight, unleash high-level absorb elements and shove with shield as bonus action.
In my party is a cleric, and with a ring of spell storing I could spare the cleric levels to get to 19 wizard levels and 1 fighter level (to get heavy armor proficiency, Protection fighting style and full ability score improvements) and bond warding with it, but I don't want to rely on magic items too much