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Saint Celestine
Seraphim squad, 2x hand flamers, superior, plasma pistol, power sword.
2x 5 woman squads, flamer, heavy flamer, combo-plasma.
Immolator, heavy bolter.

500pts for versing nids.

Celestine joins the seraphim squad, who will play forwards and harass. With 5 flamer templates and shred, they have the potential to be nasty.
The BBS squads will push down the field, one in an Immolator, and flame troops off objectives. The combo-plasmas give them some punch against anything nasty that comes along. The heavy bolter on the Immolator is a general all rounder.

Please, advice, thoughts.

I would swap the PP, PS, and 2xCombi Plasmas for at least one rhino or some extra bodies in the Seraphim. It's 500 points though, so Celestine will do most of the work anyways.