Stone spiders

Desecrate is a transmutation spell unique to clerics who worship deities of the spider domain that turns pebbles into enormous spiders, or gives vermin carapaces of stone.

Effect
When cast, desecrate causes up to three pebbles into stone constructs that resemble monstrous spiders. The constructs can be any size (from tiny to huge) as you the caster decides, but all the constructs created must be the same size. The constructs are just like natural spiders, but have enhanced natural armor, are more resistant to damage, and have a strength-draining poison.

If the constructs can hear the caster's commands, he or she can direct them not to attack, to attack particular enemies, or to perform other actions. Otherwise, they simply attack the caster's enemies to the best of their abilities.

Alternatively, stone spiders can cause up to three vermin of any type or size to gain the benefits of a stoneskin spell.