Eidolon (Final Fantasy IX)

An Eidolon is what summons, in Final Fantasy IX, are refered to as. They can only be summoned by members of the tribe that once lived in Madain Sari. After the destruction of Madain Sari, only Princess Garnet and Eiko Carol remain as members of that tribe.

The spell power of an Eidolon is based on math, item stock and length of animation, i.e. short or full length. The full length animation can be regarded as a "powered up" version of the short animated version. In total, there are 12 Eidolons. Of these 12, 8 can be summoned by Garnet and the remaining 4 by Eiko.

Garnet's Summons
The attacks and spell power for Garnet's summons are pretty straight-forward. They are based on math, item stock and length of animation, the short version being weaker in spell power than the full length version. When summoning in Trance mode, the lenght of the animation will always be short and item stock will be disregarded, but the animation will reappear in intervals to damage the enemy. This continues until a new Eidolon is summoned.

Shiva
Shiva can be obtained through the use of an Opal and its attack is called, Diamond Dust, and deals ice-elemental damage to opponents.
 * Spell power (full length animation) equals 36+# of opals in stock
 * Spell power (trance mode) equals 34