Using The paladin exploit in Onsal is indeed cheating

[Reinhardt_Azureheim]

Perhaps next they can alter how Cover/Guardian works in PvP and instead of just protecting the person for 6/10 seconds, it can be like a tethered barrier, so once the player takes x% of their target's max HP worth of damage, the cover breaks and they're vulnerable again. I don't know. I don't design games. As long as it isn't just "this person is invincible for 6/10 seconds". And something that doesn't let them use Cover while also using Guard or any other invuln. It's too cheesable.

Intervention | Ability
Cast: Instant
Recast: 25s
Effect: Grants Intervention to party member, reducing damage by x% (between 10 and 40% depending on other ideas to add here)
Duration: 8s

Adjustments can be made, but this is a generic template that has been used before and was considered strong and viable without being broken.