Being a dnd 5e primordial ward spell you have the best resistance power to acid, cold, fire, lightning and also to the thunder damage for the spell’s duration.
- Casting Time: 1 action
- Range: Self
- Components: V, S
- Level: 6th
- School: Abjuration
- Duration: Concentration, up to 1 minute
But whenever you take some damage of one of those types, so that you are allowed to use your reaction in order to gain an immunity for that type of damage, which includes against to that triggering damage. However still if you do so, the resistance could be end, and even you have some immunity until an end of your next turn, at which time the spell ends.