Cataclysm Classic: Limited Invincibility Quest Item (Patreon)
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A niche, but interesting exploit nonetheless, this one.
The quest item in question will make you effectively invincible in instanced content for a limited period.
A way down the Mount Hyjal quest line is a quest called "The Greater Of Two Evils".
This quest involves a quest item called "Talisman Of Flame Ascendancy". The Talisman itself cannot be used outside of the intended quest zone, however it can be activated within the zone and the buffs it gives you do persist outside the zone.
Using the Talisman gives you e vehicle UI and a buff called flame ascendancy for one minute. During this time you can activate a button with no cooldown called "Flame Shield" which reduces damage taken by 95% for 10 seconds. This can be used in pvp and pve content to make your character temporarily invincible.
Archvaldor Note: I am aware many of you are interested in the possibility of getting mop remix characters to integrate with Dragonflight content: I am working on this hard. It seems a lot of public info surrounding this issue is not accurate so this is taking longer than I anticipated.