Heavy rainfall has soaked your cloths and armor making it slippery. PCs gain a +2 bonus to attempts to escape a grab.
The spirits of long dead dragonborn warriors grant their blessing on you. Each PC recovers a healing surge.
The storm clouds break and the sun shines down. Once this session, PCs can gain 5 temporary hit points as a minor action.
Gather your will to fight! All PCs gain an action point that can only be used this session.
Lightning strikes the dragonborn statues. Any creature ending its turn adjacent to a statue takes 5 lightning damage.
Frogs rain down from the sky and cover the battlefield, making footing unsure. Creatures that miss with an attack fall prone.