Ideas for tank invincible button

[Donjo]

Life is unfair, but Holmgang is especially so.

That's why I try not to use Holmgang as a last ditch emergency action. I either use it as something that's all part of the plan, such as take an unreduced buster and then use Equilibrium + Beast to stabilize myself immediately... or I'll take advantage of it's less used properties, like -

- Use the root to nullify a knockback/draw-in
- Pull that pesky caster to the group, or leash an enemy that decided that the healer was a good snack
- Use the tug as a clutch interrupt
- Catch a mob that a Healer/DPS has pushed before it gets out of range

Hm. Does any other ability have this many possible uses?