@Sin If Queen stays on nearest hex from enemy unit - she should bring some damage, except for units with 100% frost resistance. But if she stays far away from enemy unit, but still in range where Nova is working, it shouldn't bring any damage, only guard breaking ability
Deals 8 Frost Text damage to all adjacent units and breaks guard mode of all units in a 3 hex radius. If you need, just divide this sentence into 2 ones: Deals 8 Frost damage to all adjacent units (in nearest hexes to your queen). And breaks guard mode of all units in a 3 hex radius.