There are 49 boss formations (42 before the Rift, plus 7 in the Rift/Void, not counting the final boss) in FFV. The 42 before the Rift are considered a boss check for key items (check the boss locations page for such bosses), except for a few removed (for example, the guardian Gargoyles fight locations do not yield a boss check, they only guard a dungeon's exterior). Bosses are given both a Tier and a Rank based on their original location. Each location's original HP is preserved, then undergoes a series of changes to its new boss upon randomization, including stats and AI of the new boss.

Tiers are an integral part of this system. There are the following parameters per boss location:

• Tiers: 1 through 4

Tiers represent major shifts in boss location power. When a boss changes tiers (e.g., from Tier 1 to Tier 2), it will change its AI movepool to reflect this change. A simple example is Shiva, who will cast Ice2 in a Tier 2 location, but will cast Ice3 in a Tier 3 location.

As of v0.79, Ranks represent the individual location where the newly randomized boss will assume. Stats are scaled from 0 - 100% from their rank 1 location (WingRaptor) to their rank 49 location (Necrophobe). Every boss in the vanilla game is assigned both a Tier and a Rank, roughly in order of how the base game progresses.

As part of randomization, every boss at every tier is given specific AI and stats. For example:

The following is an example of how boss location randomization might occur:

• Ifrit's location will be replaced with Catastrophe. Catastrophe will become an easier boss to reflect its new location at Ancient Library
• Ifrit's location in Ancient Library is a Tier 1, Rank 8 boss location, with 3000HP
• Catastrophe, although originally a Tier 4, Rank 46 boss, will now assume the role of a Tier 1, Rank 8 boss, and be placed at Ifrit's location
• Catastrophe will now take its Tier 1 stats (which are much less than its original), and take its specific Rank 8 stats
• Catastrophe will now take its Tier 1 AI (which is much less aggressive than its original)
• Catastrophe will now have 3000HP, the same as Ifrit's location
• Now, Catastrophe is a feasible fight to tackle at the Ifrit location in Ancient Library, and Ifrit will be placed elsewhere

You can refer to the boss locations explanation page, and for more details refer to the spreadsheet of statistics per boss tier here. You can easily look up the above example by finding Catastrophe in the “enemy_name” column, and Ifrit in the “loc_name”, which represents Catastrophe's stats at Ifrit's location.