Stage HP is a feature of some enemies, granting them extra health the higher the stage number they're encountered in is.
Calculation[ | ]
The formula for an enemy's total health (HP) is
where Base HP and Stage HP are the defined HP values for the given enemy and displayed in the enemies' pages, Stage is the current stage number as defined internally by the game, and min and bound are functions that take the smaller of two values or bound the middle value between the two others, respectively.
In practice, this means that the enemy gains Stage HP extra health for the first 4 stages, gains nothing for stage 5, and then 4/5ths of Stage HP for each stage up to stage 10, after which their health stops increasing.
Chapters map to stage numbers as follows:
Stage number | Normal Mode | Greed Mode |
---|---|---|
1 | Basement / Cellar / Burning Basement / Downpour / Dross I | Basement / Cellar / Burning Basement |
2 | Basement / Cellar / Burning Basement / Downpour / Dross II | Caves / Catacombs / Flooded Caves |
3 | Caves / Catacombs / Flooded Caves / Mines / Ashpit I | Depths / Necropolis / Dank Depths |
4 | Caves / Catacombs / Flooded Caves / Mines / Ashpit II | Womb / Utero / Scarred Womb |
5 | Depths / Necropolis / Dank Depths / Mausoleum / Gehenna I | Sheol |
6 | Depths / Necropolis / Dank Depths / Mausoleum / Gehenna II | The Shop |
7 | Womb / Utero / Scarred Womb / Corpse I | Ultra Greed |
8 | Womb / Utero / Scarred Womb / Corpse II | - |
9 | ??? | - |
10 | Cathedral / Sheol | - |
11 | Chest / Dark Room | - |
12 | The Void | - |
13 | Home | - |
Example[ | ]
Consider a Dip with 3 base HP and 1 stage HP.
- Basement I, i.e. stage 1: HP = 3 + (min(4, 1) + 0.8 × bound(0, 1 - 5, 5)) × 1 = 3 + (1 + 0.8 × 0) × 1 = 4
- Womb II, i.e. stage 8: HP = 3 + (min(4, 8) + 0.8 × bound(0, 8 - 5, 5)) × 1 = 3 + (4 + 0.8 × 3) × 1 = 9.4
- The Void, i.e. stage 12: HP = 3 + (min(4, 12) + 0.8 × bound(0, 12 - 5, 5)) × 1 = 3 + (4 + 0.8 × 5) × 1 = 11
Monsters and Bosses that use Stage HP[ | ]
A total of 52 Monsters and 18 Bosses use this mechanic, with the Sins counted among the latter group.
Name | ID | Base HP | Stage HP |
---|---|---|---|
Baby Begotten |
883.0 | 18 | 3 |
Baby Long Legs |
206.0 | 16 | 4 |
Big Corn |
217.3 | 6 | 2 |
Black Bony |
277.0 | 8 | 2 |
Black Maw |
225.0 | 20 | 6 |
Blister |
303.0 | 16 | 8 |
Bloodfly |
61.6 | 6 | 1 |
Blue Gaper |
297.0 | 30 16 |
0 2 |
Bone Fly |
25.4 | 8 | 3 |
Bony |
227.0 | 8 | 2 |
Boom Fly |
25.0 | 20 8 |
0 3 |
Bulb |
61.5 | 10 | 2 |
Butt Slicker |
878.0 | 16 | 3 |
Clickety Clack |
889.0 | 20 | 3 |
Cloggy |
872.0 | 15 | 2 |
Crazy Long Legs |
207.0 | 16 | 4 |
Crispy |
226.2 | 12 | 4 |
Dank Squirt |
220.1 | 15 | 6 |
Dip |
217.0 | 3 | 1 |
Dragon Fly |
25.3.0 | 8 | 3 |
Dragon Fly X |
25.3.1 | 8 | 3 |
Drip |
870.0 | 3 | 1 |
Drowned Boom Fly |
25.2 | 20 8 |
0 3 |
Dump |
876.0 | 10 | 1 |
Dump Head |
876.1 | 10 | 1 |
Eggy |
29.2 | 20 | 2 |
Fetal Demon |
886.1 | 40 | 3 |
Flesh Maiden |
880.0 | 24 | 4 |
Fly Trap |
873.0 | 16 | 6 |
Grub |
239.0 | 10 | 2.5 |
Gurgling |
237.0 | 24 | 4 |
Hardy |
826.0 | 15 | 6 |
Holy Bony |
227.1 | 60 | 14 |
Holy Eye |
60.2 | 20 | 5 |
Holy Mulligan |
22.2 | 40 | 3 |
Leper Flesh |
310.1 | 5 | 1.5 |
Ministro |
305.0 | 9 | 2 |
Planetoid |
229.1 | 28 | 4 |
Polty |
816.0 | 14 | 2.5 |
Portal |
306.0 | 9 | 5 |
Red Boom Fly |
25.1 | 20 8 |
0 3 |
Red Ghost |
285.0 | 25 20 |
5 4 |
Rotty |
226.1 | 16 | 5 |
Sick Boom Fly |
25.5 | 8 | 3 |
Skinny |
226.0 | 10 | 4 |
Small Baby Long Legs |
206.1 | 12 | 4 |
Small Crazy Long Legs |
207.1 | 12 | 4 |
Splasher |
238.0 | 10 | 2 |
Splurt |
871.0 | 15 | 6 |
Squirt |
220.0 | 15 | 6 |
Swarm Spider |
884.0 | 4.5 | 0.2 |
Tainted Mulligan |
22.3 | 120 | 8 |
Tainted Sucker |
61.7 | 14 | 1 |
Vis Fatty |
886.0 | 40 | 4 |
Wizoob |
219.0 | 25 20 |
5 4 |
Headless Horseman |
82.0 | 160 | 30 |
The Fallen |
81.0 | 60 | 45 |
Krampus |
81.1 | 60 | 45 |
Envy |
51.0 | 60 40 |
7.5 |
Gluttony |
49.0 | 60 | 15 20 |
Greed |
50.0 | 60 | 15 20 |
Lust |
47.0 | 60 | 15 20 |
Pride |
52.0 | 60 | 15 20 |
Sloth |
46.0 | 60 | 15 20 |
Wrath |
48.0 | 60 | 24 |
Super Envy |
51.1 | 60 40 |
7.5 |
Super Gluttony |
49.1 | 60 | 15 25 |
Super Greed |
50.1 | 60 | 15 25 |
Super Lust |
47.1 | 60 | 15 25 |
Super Pride |
52.1 | 60 | 15 25 |
Super Sloth |
46.1 | 60 | 15 25 |
Super Wrath |
48.1 | 60 | 24 30 |
Ultra Pride |
46.2 | 85 | 15 25 |
Trivia[ | ]
- The Wizoob and Red Ghost are the only entities whose Stage HP were reduced in Repentance, both from 5 to 4.
- The Monster with the lowest Stage HP (and with the lowest amount among all entities) is the Swarm Spider at 0.2, while the Monster with the highest is the Holy Bony with a staggering 14, nearly twice the amount of 2nd place. All other Monsters have an amount between 1 and 8.
- The Boss with the highest Stage HP (and with the highest amount among all entities) is a tie between Krampus and The Fallen at 45. All other Bosses have an amount between 7.5 and 30.
The Binding of Isaac: Rebirth |
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