after seven of them attack
spoilered for length
Spoiler
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(1d20+1)[13]
(1d6+1)[5]
(1d20+1)[17]
(1d6+1)[4]
(1d20+1)[5]
(1d6+1)[7]
(1d20+1)[21]
(1d6+1)[7]
(1d20+1)[13]
(1d6+1)[7]
(1d20+1)[8]
(1d6+1)[6]

a blast from your holy symbol destroys 4 of them
the last one attacks
(1d20+1)[17]
(1d6+1)[2]