The Seitengrat is an invisible bow in the Zodiac versions of Final Fantasy XII. It is one of four secret equipment pieces added in these versions, including the ultimate one-handed melee weapon Great Trango, the lethal status combination-inflicting weapon Bonebreaker, and the high evasion all element-absorbing shield Gendarme. Like many of the added weapons, Seitengrat requires no license to equip.
The Seitengrat is by far the most powerful weapon in the game, and has double the range of all other long-range weapons, which makes it an easy choice for clearing out regular mobs.
A defensive alternative to the Seitengrat's 225 attack and 75 Evasion, is the Great Trango that has 153 attack but is one-handed and so can be equipped alongside the Gendarme shield with 90 evasion, 90 Magick evasion and which absorbs all elemental damage.
The Seitengrat can be obtained when the player can board the Skyferry. Entering the deck of the Skyferry offers a 1% chance for an invisible chest to spawn on the deck, that has a 20% chance of containing an item, and if the player has the Diamond Armlet equipped, the chest has a 5% chance of containing the Seitengrat. With this 0.01% chance every time the deck is entered (assuming the player knows of the hidden chest), the Seitengrat was intended to only be gotten by fluke or serious persistence. However, with RNG manipulation one can guarantee the chest spawns and relinquishes a Seitengrat.
It is possible to guarantee that the Seitengrat will spawn on the Skyferry by exploiting the game's random number generator (RNG) in The Zodiac Age version, with various methods such as this in this YouTube guide. The player should create a new save file in Nalbina Fortress at the beginning of the game as Reks, and then load their main save file. In their main save file, the player should set Vaan as the main party member and equip him with a Diamond Armlet, and then visit Rabanastre and take the Skyferry to Nalbina. From there, the player should enter the deck, and then close their application.
The player should load up their newly created save file at the beginning of the game in Nalbina Fortress as Reks, and cast Cure on themselves, until the amount cured is three specific numbers in the exact order: 88, 97, then 90. The player should quit to title screen, load the auto-save made in the Skyferry, and the invisible Seitengrat chest will have spawned. Go to the chest and watch the NPC on the stairs. He'll regularly climb up and down them. On his fourth time going up the stairs, open the chest as his feet hit the top step. This method also works on PlayStation 5.
Depending on the player's PlayStation 4 model, they may want to use another number set due to differing RNG positions. One such differing set is 97, 94 and 95. This time, after loading the Skyferry file, the player should run up to the chest and watch a child NPC to the left looking over the railing. The child will run to the right end of the railing and then to the left end. Finally, he'll return to his original position. The player should open the chest as soon as he enters said original position.
For the Steam version, the player may opt to use the third party tool Cheat Engine to force the chest to spawn with the desired item inside.
When the player acquires the Seitengrat, they can go to the Cerobi Steppe's Old Elanise Road area, equip it, and near the entrance from the Tchita Uplands, by a tree, an arrow will float in the air at about head-level. The arrow will be the same type as the player's currently equipped arrow. (This is shown in the infobox image.)
- Hiroyuki Ito interview from the Final Fantasy XII International Ultimania (Translation)