From Ars Magica
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Summon water from nearby water sources to guard you.
Applies Water Shield (buff) to the caster based on a combination of how many water sources are nearby, and how long the caster channels. Increases buff duration faster with more water sources nearby.
Nearby is defined by a cube with the radius of 4 blocks.
Can be extended by channeling the spell with nearby valid sources while the buff is still active.
Adds 2 seconds to the buff per second channeled per valid nearby source, up to a maximum of 45 second duration.
Costs 40 mana * number of nearby valid blocks per second channeled regardless of Casting Mode.