Summoning Spirits So Over-Powered It's Broken?, New Player Needs Help Understanding Options

[Aedosen]

SOLVED! SEE POSTS BELOW. THANKS FOR THE HELP EVERYONE.

Unless I'm missing something, it seems like a standard 400bp starting character is way overpowered if they are a mage/shaman who's good at summoning.

For example, an Elf shaman with high charisma and summoning (built for summoning basically) skill can summon force 6 spirits pretty much indefinitely unless he gets unlucky on some drain resist checks.

Summon a Force 6 Spirit
- Elf rolls Magic + Summoning = 12
- average successes = 4
- Spirit rolls Force = 6
- average successes = 2
- average services owed to Elf = 2
- average drain value = 4
- Elf rolls Charisma + Willpower = 13 to resist drain
- average successes = 4
- Elf now has Force 6 spirit; took 1 combat round to summon; Elf took no drain

Force 6 Spirit
- has armor 12 (physical/stun damage value must exceed 12 to harm it at all)
- if damage value exceeds 12, spirit still gets 12 added to soak pool
- it can blast or bash or grapple targets until they are all dead
- Elf picks 2 optional spirit powers when summoned for added utility or deadliness
- attackers can use their Willpower to fight the spirit

This Elf shaman can summon up to 8 of these and unleash them all at once to lay waste to foes. A character not maximized for summoning could summon these spirits at force 4 or 5 and have 6 of them.

Am I missing something that would prevent spirit summoners from completely ruining every game with their spirit servants?