Dungeons 3

This is done in the "The End of Yaina Overproud" level. In this level, Yaina Overproud creates 3 Arcane Tears in your dungeon that hurt your Dungeonheart. They will spawn randomly in your dungeon. To get this trophy you must destroy all 3 spawned Tears within 60 seconds.

Because of Hearts are trump, you actually only need to do this exactly once i.e. defend against the 3 spawned Arcane Tears the first time it happens. It's actually not possible to defend a 2nd time if you want to get Hearts are trump as well. See Hearts are trump for more info.

For the 1st wave of 3 Arcane Tears, 5 creatures are sufficient to destroy all 3 under 60 seconds, if you grab all 5 creatures (including Thalya), drop all of them at one Tear, destroy it, then quickly pick all of them up again - rinse and repeat for the other 2 Tears. The timer for the 2nd wave of Arcane Tears serves as a convenient timer: If it says more than 19:00 on the timer for the 2nd wave after you've destroyed all 3 Tears, you're in the clear.