Bribing is something you can do in the Dark Assembly to raise your approval with the Senators.
 Effect On Senator Disposition
When you show a Senator an item, he can have one of five different reactions toward it. Each reaction doesn't always have the same effect on the Senator's Disposition (i.e., two different items that he is "Interested" in might affect him differently). Here are the ranges associated with reaction.
|Must Have!||Always +8 (Will Greatly Boost Approval)|
|Interested||+4 to +7 (Will Boost Approval)|
|Slightly Interested||+1 to +3 (Will Slightly Boost Approval)|
|Not Very Interested||-2 to +0 (Will Slightly Lower Approval or have no effect)|
|Does Not Want||-8 to -3 (Will Lower Approval)|
 The Effect Of Rarity
Have you ever wondered what causes Senators to like certain items and hate others? Well, it's all about Rarity; not broad rarity ranges like Legendary or Rare, but specific numbers, like 56 or 178.
When you started the game for the very first time, every Senator in the Dark Assembly (with a few exceptions) was randomly assigned a number. Each number was in the range of 0-255. This number is called the Senator's "Magic Number". The Senator loves this number. If you show him an item that has a rarity value that is exactly equal to his Magic Number, his reaction to it will be "Must Have!". His reaction to items with a nearby rarity will also be "Must Have!". Additionally, the Senator's Magic Number determines how he will react towards any item you present to him.
Note: When you start a New Game +, the Senators' Magic Numbers do not reset, so if you find one out for a Senator, it will always work for him, as long as you're using the same saved game.
To start off, here are a few examples of possible patterns a Senator could have.
Now, that's a lot of information, but don't panic. If you look at those long enough, you're bound to notice some patterns between them. One thing you may notice is that each reaction covers multiple rarity values (e.g., "Must Have!" in the first example covers rarities 83-97). These are called reaction ranges. Different reaction ranges cover different amounts of rarity values. For example, the "Must Have!" range always covers 15 rarity values while the "Does Not Want" range always covers 81 rarity values. The other three reactions are split into two ranges. The total number of rarity values contained within each reaction is as follows.
|Reaction||Total Rarity Values|
|Does Not Want||81|
|Not Very Interested||48 (24 per range)|
|Slightly Interested||48 (24 per range)|
|Interested||64 (32 per range)|
If you add all of those up, you'll get a total of 256 for all 256 rarity values possible (0-255).
As you can see, the the "Must Have!" is 15 rarity values long. The value in the very middle of that is the one referred to as the "Magic Number". It can easily be calculated using this Calculator.
 Using The Magic Number
As mentioned before, the Senator's Magic Number determines his reaction toward any rarity value. Now, to do that, we need to use math, so for mathematical purposes, we're going to refer to the Magic Number as [D]. Instead of boring you for a while longer, here's exactly how the Magic Number is used to determine the Senator's reaction toward any item. All Senators except Tengan and White Dragon Party Senators follow this pattern in relation to rarity.
|[D-87] to [D-64]||Not Very Interested|
|[D-63] to [D-40]||Slightly Interested|
|[D-39] to [D-8]||Interested|
|[D-7] to [D+7]||Must Have!|
|[D+8] to [D+39]||Interested|
|[D+40] to [D+63]||Slightly Interested|
|[D+64] to [D+87]||Not Very Interested|
|[D+88] to [D+168]||Does Not Want|
If one of the rarity values goes below 0 or over 255, you need to add or subtract 256, respectively. For example, if [D] is 59, the second "Not Very Interested" range would incorrectly be [-28] to [-5], so we would have to add 256 to both values to correct it, making it  to . Instead of using the table, you can use this Calculator. Here's an example of what you'd get if you applied a magic number of 100.
|13 to 36||Not Very Interested|
|37 to 60||Slightly Interested|
|61 to 92||Interested|
|93 to 107||Must Have!|
|108 to 139||Interested|
|140 to 163||Slightly Interested|
|164 to 187||Not Very Interested|
|188 to 12||Does Not Want|
Now, also using the Magic Number, you can determine exactly how much the Senator's Disposition is affected by an item of a particular rarity. There isn't a calculator for this, yet, though, so you have to do it yourself.
If one of your rarity values goes below 0 or over 255, add or subtract 256, respectively. Much thanks to HenryEX for figuring out these values.
Notice that the affection point change differs every eight (8) rarity values. Because of this, we can use this handy formula pointed out by ragnarokesper on the Disgaea: Hour of Darkness board at GameFAQs.
Disposition change = 8 - Trunc[|D - R| / 8] Trunc = Truncate function; remove decimal. |.....| = Absolute Value; always Positive. If it's negative, make it positive. D = The rarity value the Senator most desires; in the middle of the "Must Have!" range. R = Rarity of item.
- Tengan, a legendary Senator, does not follow the rules like everyone else. He doesn't want any particular rarity, but rather wants a particular item type. He'll announce exactly what once you enter the Assembly. If you give it to him, his status will instantly change to Love<3.
- White Dragon Party Senators don't accept bribes at all, so this rarity stuff means nothing for them.
- Even though the Collector Specialist will raise rarity, it will not change how the Senator reacts toward the item, even if it pushes the item's rarity into another reaction range.
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