The Binding of Isaac: Rebirth

The Binding of Isaac: Rebirth

[REP+] Mastema (+26 Unlocks)
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Hybrid  [developer] 9 Aug, 2021 @ 1:21pm
Item Unlock Ideas
Put your ideas for item unlocks here. It can be an item, trinket, card/rune, whatever you can think of. Get as creative as you'd like.
Last edited by Hybrid; 1 Sep, 2021 @ 2:28pm
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Showing 1-15 of 21 comments
Bash 15 Aug, 2021 @ 10:02pm 
Soul of Mastema - Pay one heart container (or two soul hearts) to duplicate all items in the room
Hybrid  [developer] 15 Aug, 2021 @ 11:18pm 
Originally posted by Bash:
Soul of Mastema - Pay one heart container (or two soul hearts) to duplicate all items in the room
I think I've got the effect for his soul stone done but that's a cool idea for another type of item, thanks for the suggestion. :)
Bash 16 Aug, 2021 @ 12:09am 
Ok in that case I have another suggestion. A passive item that guarantees a sacrifice room to spawn on every floor. Or a trinket that guarantees a sacrifice room to spawn when entering a new floor while held.
Bash 16 Aug, 2021 @ 12:13am 
A trinket that gives The Wafer effect when taking damage from non-enemy sources (like sacrifice room spikes or devil beggars)
Hybrid  [developer] 16 Aug, 2021 @ 9:42am 
Originally posted by Bash:
A trinket that gives The Wafer effect when taking damage from non-enemy sources (like sacrifice room spikes or devil beggars)
I don't think I can do anything that affects room generation but I love this trinket idea. I'm surprised there isn't something like this already in the game. Well there will be after I add it. I like your ideas a lot, let me know whenever you come up with anymore.

Also I'll go ahead and say what I have so far. I've got his soul stone done like a said, a trinket, and 6 items but I'm not sure I like one of them and wanna include it, so let's just say 5.
Bash 16 Aug, 2021 @ 10:15pm 
Originally posted by Hybrid:
Originally posted by Bash:
A trinket that gives The Wafer effect when taking damage from non-enemy sources (like sacrifice room spikes or devil beggars)
I don't think I can do anything that affects room generation but I love this trinket idea. I'm surprised there isn't something like this already in the game. Well there will be after I add it. I like your ideas a lot, let me know whenever you come up with anymore.

Also I'll go ahead and say what I have so far. I've got his soul stone done like a said, a trinket, and 6 items but I'm not sure I like one of them and wanna include it, so let's just say 5.
Glad you like my ideas man :D I'm excited to see what's next for this mod.

I do have another idea. An item that gives you a chance of creating a clot (like the ones Tainted Eve makes) when you take damage. The type of clot would depend on the type of heart that was damaged (e.g. soul heart = blue clot).
Last edited by Bash; 16 Aug, 2021 @ 10:30pm
Hybrid  [developer] 16 Aug, 2021 @ 10:47pm 
Originally posted by Bash:
Originally posted by Hybrid:
I don't think I can do anything that affects room generation but I love this trinket idea. I'm surprised there isn't something like this already in the game. Well there will be after I add it. I like your ideas a lot, let me know whenever you come up with anymore.

Also I'll go ahead and say what I have so far. I've got his soul stone done like a said, a trinket, and 6 items but I'm not sure I like one of them and wanna include it, so let's just say 5.
Glad you like my ideas man :D I'm excited to see what's next for this mod.

I do have another idea. An item that gives you a chance of creating a clot (like the ones Tainted Eve makes) when you take damage. The type of clot would depend on the type of heart that was damaged (e.g. soul heart = blue clot).
I'm glad to hear that! Hopefully I can actually do the unlock system cause I've never done something like that and I'm dreading it. But I'm gonna try to finish all the items before I even attempt that.

And that sounds like a fun item. One of the items I made also has an on hit effect and I'm honestly still not sure if I should make it always activate but only when hit by an enemy (to prevent it being abused from things like demon beggars) or allow it to activate from any hit but make it a percent chance. I could probably include your clot idea, it's kind of similar to the one I made but at the same time it's different.
Sky 20 Aug, 2021 @ 2:39pm 
Reading up on the Book of Jubilees, I found this,
And the prince Mastêmâ sent ravens and birds to devour the seed which was sown in the land, in order to destroy the land, and rob the children of men of their labours. Before they could plough in the seed, the ravens picked (it) from the surface of the ground. And for this reason he called his name Terah because the ravens and the birds reduced them to destitution and devoured their seed. And the years began to be barren, owing to the birds, and they devoured all the fruit of the trees from the trees: it was only with great effort that they could save a little of all the fruit of the earth in their days.
Now Soul of Eve sounds a lot like that, so I'm trying to think of what can be done. Perhaps an active item, themed like a crow, that when used, consume pick ups in the room for temporary stat ups that fade over time?
Sky 20 Aug, 2021 @ 2:44pm 
Another one I found.
For on this night -the beginning of the festival and the beginning of the joy- ye were eating the passover in Egypt, when all the powers of Mastêmâ had been let loose to slay all the first-born in the land of Egypt, from the first-born of Pharaoh to the first-born of the captive maid-servant in the mill, and to the cattle.
Some sort of passive item that auto-kills 1 enemy in each room (bosses aside ofc, maybe they can take a 15% hp reduction similar to the effects of the tick)
Hybrid  [developer] 20 Aug, 2021 @ 3:06pm 
Originally posted by Soaring__Sky:
Another one I found.
For on this night -the beginning of the festival and the beginning of the joy- ye were eating the passover in Egypt, when all the powers of Mastêmâ had been let loose to slay all the first-born in the land of Egypt, from the first-born of Pharaoh to the first-born of the captive maid-servant in the mill, and to the cattle.
Some sort of passive item that auto-kills 1 enemy in each room (bosses aside ofc, maybe they can take a 15% hp reduction similar to the effects of the tick)
Yeah I saw stuff about crows too but like you said that would be too similar to Soul of Eve. I could try doing something like that active item though.

And I like the passive idea you mentioned. I'm thinking it could kill the enemy with the highest hp in the room, and reduce boss health like you said. That would be pretty useful.
Last edited by Hybrid; 20 Aug, 2021 @ 3:31pm
cadetpirx 27 Aug, 2021 @ 10:44am 
A new card for Defeating Ultra Greedier as Tainted Mastema:Unholy Card
Gives you a random devil deal item,but also gives you broken hearts depending on the quality of that given item.
Hybrid  [developer] 27 Aug, 2021 @ 10:53am 
Originally posted by cadetpirx:
A new card for Defeating Ultra Greedier as Tainted Mastema:Unholy Card
Gives you a random devil deal item,but also gives you broken hearts depending on the quality of that given item.
Spoiler alert: one of the items is VERY similar to that. ;)
Sky 1 Sep, 2021 @ 7:01pm 
If you'd like to keep with the tarot theme, there are some decks that name the blank card. Like seen here: https://tarotofempowerment.com/the-unknown/
The card has the same meaning facing up and down, as it simply means the answer in divination is not known. Some ideas for that could be for it to apply a random tarot effect, or to teleport to the I Am Error room. I have created a sprite for it here, feel free to use it if you'd like: https://i.imgur.com/SJUa9A8.png

Three other concepts I made sprites for, if you'd like:
Book of Hamsa: https://i.imgur.com/ZGzEWO6.png
Ceres: https://i.imgur.com/IdHBqgf.png
Singularity: https://i.imgur.com/XXcpjHG.png
Infested Penny: https://i.imgur.com/FyzPIU1.png
Philosopher's Stone: https://i.imgur.com/zTxx8Yh.png
(tbh the only effects i really remember are Singularity, where it was a shower thought about a reverse Void where it lowers Isaac's stats and spawns an item from the current item pool, lowering more stats each time it's used, and Infested Penny which spawns blue spiders when you pick up coins)
Last edited by Sky; 1 Sep, 2021 @ 7:02pm
Hybrid  [developer] 1 Sep, 2021 @ 8:43pm 
Originally posted by Soaring__Sky:
If you'd like to keep with the tarot theme, there are some decks that name the blank card. Like seen here: https://tarotofempowerment.com/the-unknown/
The card has the same meaning facing up and down, as it simply means the answer in divination is not known. Some ideas for that could be for it to apply a random tarot effect, or to teleport to the I Am Error room. I have created a sprite for it here, feel free to use it if you'd like: https://i.imgur.com/SJUa9A8.png

Three other concepts I made sprites for, if you'd like:
Book of Hamsa: https://i.imgur.com/ZGzEWO6.png
Ceres: https://i.imgur.com/IdHBqgf.png
Singularity: https://i.imgur.com/XXcpjHG.png
Infested Penny: https://i.imgur.com/FyzPIU1.png
Philosopher's Stone: https://i.imgur.com/zTxx8Yh.png
(tbh the only effects i really remember are Singularity, where it was a shower thought about a reverse Void where it lowers Isaac's stats and spawns an item from the current item pool, lowering more stats each time it's used, and Infested Penny which spawns blue spiders when you pick up coins)
Oooh those are some really cool ideas. The thing is that I feel like they don't really have much to do with the character. Now I do have a couple items that might not relate much to them, but I don't think there should be too many.

But lemme tell you, I LOVE the idea of Singularity. In fact, I already know what my next character, if I ever get to it, is gonna be themed around. Don't be surprised if Singularity and that tarot card are unlocks for that character. That won't be anytime soon though.

Also here's another progress update. I have 16 items in total now. Still much work to be done but it's getting there. I'm just taking my time with it, I'm in no rush. Also know that tainted Mastema's delirium unlock is CRAZY good.
Sky 2 Sep, 2021 @ 5:11am 
Looking forward to it!
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