Dungeons 3

This is done in the "Ups and Downs" level. The main objective of the level is for Thalya to corrupt 3 water points. Similar to the previous levels where Thalya is frozen while trying to "convert" an objective, this time Thalya is frozen and 2 of the water points are in areas where high tide will submerge so you have to time your attacks and conversion attempts with the high tide window. At the same time, crabs and Heroes will spawn while Thalya is contaminating the water point so prepare your defence of Thalya, making sure to surround her. If you manage to corrupt all 3 water points without Thalya getting hit, the trophy will pop along with the level complete trophy Tide Master.