Tomb of Levistus eldritch invocation (from Xanathar's Guide to Everything, p. 57):
Tomb of Levistus
As a reaction when you take damage, you can entomb yourself in ice, which melts away at the end of your next turn. You gain 10 temporary hit points per warlock level, which takes as much of the triggering damage as possible. Immediately after you take the damage, you gain vulnerability to fire damage, your speed is reduced to 0, and you are incapacitated. These effects, including any remaining temporary hit points, all end when the ice melts.
With a Tiefling warlock Infernal heritage (Racial) grants her fire resistance
How would this invocation (Specific) interact with this racial feat (General)?
Do they cancel?
Or does the magic of the Tomb of Levistus (Specific) overpower infernal heritage (General) completely?
Which applies here? General Vs. Specific rules, or, Resistance vs. vulnerability rules?