Heaven's Call
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Retrograde Neptunus item
Retrograde Neptunus is a familiar in Heaven's Call, a mod for The Binding of Isaac.
Description
Spawns a trident familiar that behaves like a faster-moving version of Mom's Knife that does not prevent Isaac from using tears.
The trident can deal damage 3 times per second, and the contact damage is calculated using the following formula: DamageStat × (1 + 3.5 × TridentForce), doing a maximum of DamageStat × 4.5 at full charge; if the trident is not in the air, the damage is equal to Isaac's damage.
Trident force increases by 10 / MaxFireDelay per second while any attack button is held and cannot exceed 1.
The trident can open black holes over enemies killed while it's traveling in the air; this effect happens with a chance of 4%, going up to 30% with 20 luck.
Item pools
Retrograde Neptunus can be found in the following item pools:
| Name | Weight |
|---|---|
| Ultra Secret Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| stars | Contributes towards unlocking Planetariums. |
| offensive | Can appear for  Tainted Lost. |
| summonable | Can be summoned via  Lemegeton. |
| monstermanual | Can be summoned via  Monster Manual. |
Special synergies
The following special synergies and interactions for Retrograde Neptunus have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | BFFS! | Doubles the contact damage and increases the length of its hitbox by 20%. |
| --- | Forgotten Lullaby | The final trident force gets multiplied by 1.5. |
| Heaven's Call | Retrograde Neptunus | +100% damage. |
| --- | Jacob's Ladder | The trident will be converted to an electric guitar, this change is only cosmetic. |
| --- | Pisces | The trident will be converted to a golden one, this change is only cosmetic. |
* Note that not all possible synergies and interactions are listed here.
External links
- Download Heaven's Call from the Steam Workshop.
Retrograde Jupiter 
Retrograde Saturnus 
Retrograde Uranus 
The Hyperdice 
Space Jam 
Asteroid Belt