Runestones

Runestones are precious gems that harness elemental power. They are only found when magic and elements collide, making them quite rare. Various types of Runestones can be found, each with different effects. They can also be used to craft Elemental Weapons.

Runestones have a 5% chance to be dropped by Fossilized Bloons. The type of bloon they come from is quite obvious.

The Runestone types are as follows:
 * Sacred/Holy
 * Cursed/Dark
 * Fire
 * Water
 * Ice
 * Earth
 * Thunder
 * Poison
 * Bomb
 * Wind

Effects
NOTE: Only one type of Runestone may be applied to each tower.

NOTE 2: Each Runestone gives 50% damage resistance to the respective element.

Fire Runestone

 * +15% chance of burning bloons for 3 seconds, dealing 1 damage every second.
 * +1 Damage

Ice Runestone

 * +10% chance of freezing bloons for 0.5 seconds.
 * +1 Popping Power

Water Runestone

 * +20% chance of making a bloon wet.
 * +10% chance of slowing bloons down by 10% for 3 seconds.

Thunder Runestone

 * +10% chance of causing electricity arcs.
 * +5% chance of making bloons move backwards for 0.5.

Earth Runestone

 * +10% chance of stunning bloons for 0.5 seconds.
 * +1 Popping Power

Poison Runestone

 * +15% chance of poisoning bloons for 15 seconds, dealing 1 damage every 5 seconds. Poison is slow, but does not cancel any other effect, unlike burn.
 * +25% DoT damage

Wind Runestone

 * +10% chance to blow bloons away by 40px.
 * +100% Blimp damage

Bomb Runestone

 * +10% chance for projectiles to explode (ala Splodey Darts).
 * +20% AoE

Holy Runestone

 * +5% chance to shoot towers, making them invulnerable to damage for 1 second.
 * +25% healing power
 * Healing is 25% more efficient in this tower.

Dark Runestone

 * +5% chance to doom bloons for 5 seconds.
 * -10% maximum HP
 * Healing is 25% less efficient in this tower.