Iazo's Power

Name of Power: Crows of Fate
Usage: To injury and distract
What it does: It's a spell, it calls a murder of crows. Spell birds actually, the dive-bomb the person but don't attack only if the orders are given. Originally his mother's technique which she used to actually kill people. He modified it and turned into to where the birds didn't end up killing. Certain words are said to summon the crows-

Cada dia en viu, cada dia es mor
El destí ha molts girs i voltes.
Tot i destinació està
S'acaba de cremar i cremar
Fins que el a terra.
Sis metres sota terra, sense un so

Translation:.
Every day you live, Everyday you die.
Fate has many twists and turns.
Even though fate Lies
It ends up to burn and burn
Until your in the ground.
Six-feet under without a sound

Please add an estimate of how many crows are in the murder. ((Rough numbers like from 25-30 or whatever it is)) If they are spell birds can they be killed like normal birds, or do they disappear when attacked?