Poison Clash Royale WikiThe Poison is a spell card available from Arena 5. With lifetime of 10 seconds, the Poison deals damage in 3.5 radius, starting with 42 damage per second and 17 Crown Tower damage, and is upgraded up to 81 damage per second and 33 Crown Tower damage. The Poison creates a circle and damages both troops and buildings. It is used to support the troops that are headed to the opponents Towers. It damages easily troops with low hitpoints. Combined with cards with high hitpoints such as the Giant, and supported with other smaller group troops, the poison will slow down the opponent’s troops, and it will also stop the opponent to draw other cards in the field, because it will make no sense. Clash Royale describes the Poison as: “Covers the target are in a sticky toxin, damaging and slowing down troops and buildings. Yet somehow leaves the grass green and healthy. Go figure!”