Haven't unlocked Stormcaller yet. I just know it's a little companion ball thingy that flies around you and shoots at enemies.
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Even in PvP it's good. Not great but it definitely catches the enemy off guard.
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Yes, it shots around 3 shot burst on enemies. It takes two time that attack to kill centurion and to bring normal adds to like 10% of HP with one attack. So not bad. Here is video if you want. At the end he tests damage of Arc Soul: https://www.youtube.com/watch?v=ZqZf6GlPw4M&lc=z22rcxobbmydyxzspacdp4333dzpxcesfrdlze5nr15w03c010c.1504818083401833