Crushing wave (at least on weapons) is 5% for 3 ticks of cold/bludeon damage, not 35% for 1 tick.... i havent used wave guard, so i could be wrong here
Being a dual-shard effect like lighting strike im guessing salt guard is also 2% for 4 ticks, again i could be wrong, as ive never actually used it...
using these assumtions:
1d8 = 4.5
50% 1d4 = 1.25
1d8 = 4.5
1d4 = 2.5
20% 2d8+8 = 3.4
5% wave = 10.5
2% lighting = 12
2% dicintegrate = 10.5
2% corrosive salt = 6.2
total: 55.35 damage per hit
Lets say.... while fighting aaretrikos for example... you might get hit... say 30 times per minute? more or less depending on how close you stand next to the tempest/kensai
55.35 x 30 / 60 = 27.675 dps
unfortunatle he is immune to 11.25 of that damage....
so its more like 44.1 x 30 / 60 = 22.05 dps