8th Level: As Sea of Arachnida. 13th Level: As Deathly Swarm. 18th Level: As Tide of Death. 23rd Level: As Deadly Fountain. 28th Level: As Surging Death.
The spider box is placed in the owner's square. If the power is an area attack, the area of effect of the power is centered around the square the spider box is placed in as if it where a close attack made by the spider box. The power does not affect you (as if you used the power), and the power's attack and damage rolls are made by you (rather than the box).