The following article is based on a subject that has not been officially named in any official Square Enix material; the current title is merely a placeholder.
Within Ragnarok, the player must clear the airship of Propagators. The Propagators act like bosses, with the boss theme playing during battle and the party is unable to escape, but they can be seen on the field and thus avoided. The player must kill them in colored pairs or otherwise the Propagators will respawn and must be defeated again.
In Final Fantasy XI, every monster has a set amount of time after death before they respawn. On average, regular monsters take five minutes to respawn in field areas, and fifteen to respawn in dungeon areas. Every Notorious Monster has a specific way for them to spawn, be it a specific amount of time, such as half an hour to two hours, or a "lottery spawn", when a Notorious Monster will spawn instead of one specific monster.
This monster must be killed in order for the notorious monster to appear. One other notable method of spawning Notorious Monsters is known as "force spawn", where a monster is spawned by either trading an item to a "???" on the ground, or by examining the "???" with the required key items.
Opponents, and sometimes random non-playable allies, spawn on the field, but many enemies spawn only when a special condition is fulfilled. Most zones have a maximum limit of six enemies at once, but there are some exceptions.
Most enemies in the game have a chance to spawn when the player simply enters the area, but there are also enemies that only spawn during specific weather conditions (Entites especially) or only after the player has stayed in the zone/area long enough time. Rare Game usually have much more specific spawn requirements, such as spawning only when another enemy is killed, or when the player kills all enemies of a specific type, or all enemies in the area. Some Rare Game replace a common enemy at certain percentage of the time or only spawn when the game clock has a specific minute number or when a party member's HP drops to HP Critical.
While most enemies spawn when the player is close enough to see them, some enemies spawn suddenly, such as jumping out of water (frogs), coming out from the ground (undead), dropping down from above (flan) or just simply appearing out of nowhere, like in the case of some reapers. Some enemies spawn with the Vanish status and are not noticeable until they turn aggressive.
Also, once something has been stolen from an enemy one can't steal from that enemy again unless it re-spawns. The only exception is the "green bar" neutral enemies; stealing from a neutral enemy, then zoning out once and returning will have returned the enemy to its neutral state, restoring its steal item. With the Immobilize glitch the player can make enemies that have already spawned disappear.
Some enemies can only spawn once special conditions have been met. Marks only spawn once the hunt for it has been accepted, and trophy Rare Game only spawn once the player has started the Rare Game sidequest on Phon Coast.
Some Rare Game have a percental chance to spawn whenever the player enter a specific area. Single-zoning will not cause these enemies to disappear, so the best way to spawn them is to single-zone repeatedly. After single-zoning 10-20 times in a row, the chance of that enemy having spawned will be over 99%. This does not work with enemies who replace a normal enemy, such as Alpha Wolf.
In order to completely respawn an enemy the player can move two zones away, move one zone away and come back after five minutes, or load their game. Enemies can also respawn even if the player stays in the same area, but the process takes two to three minutes, and an enemy can respawn at maximum two times, although some enemies never respawn this way. This may be useful when trying to kill a certain regular enemy that does not spawn frequently; after killing them for the first time, the player can just stick around for a few minutes to kill them at the same spot again.
Rare Game never spawn again this way, and trophy Rare Game never respawn once killed. Some enemies will not respawn until the player leaves the entire area, then returns. This can be bypassed with the Zone out glitch. Also, some teleporting enemies are able to chase players from one zone to another. If this happens, the player can spawn another version of that enemy in the zone the enemy original spawned.
In Final Fantasy XIII, the enemies' spawn mechanics are rather straightforward. Enemies have a specific spot on the field where they spawn. When a player moves past them the enemies may try to chase the player, but soon return to their original spawn spot, and won't chase players across maps like in Final Fantasy XII. The enemies respawn once the player moves far enough away from the spawn spot, then returns. Enemies fought as part of missions will not spawn unless the player first activates the mission.
When party travels across the map, monsters emerge at random intervals. This system is a kind of mix between the old-fashioned random encounters, and the more recent system where monsters are engaged on the field. When monsters emerge the Mog Clock activates. If the player engages the enemies by slashing them with their weapon, they begin the battle with a preemptive strike. The player can avoid encounters by running away from the enemies after they have appeared on the field, but if they run out of time on the Mog Clock during it the battle will initiate anyway and the party cannot escape from the battle.
Enemies spawn on the field. Which enemies spawn where and how frequently depends on time of day. Usually only one enemy/enemy group spawns at a time. Some areas are monster-free, and after killing the Last One of a monster species, they will go extinct. In Chaos infusions stronger variants of the enemies spawn with boosted stats who give better battle spoils. Enemies emerge randomly, and Lightning must come into contact with them on the field to initiate a battle. If Lightning runs, the enemy may pursue for a while, but eventually disappears.
On Normal and Hard Mode battle difficulties, attacking enemies who are yet to notice Lightning starts a preemptive battle where the enemy loses 25% of its HP at the start. Attacking enemies first loses 10% of their HP, and if an enemy initiates a battle Lightning loses 10% of her HP. Special enemies, like some bosses and Last One monsters, leave treasures on the floor after being defeated.
In video games, spawning is the live creation of a character or item. Respawning is the recreation of an entity after its death or destruction.