Mirror Dungeon 5 - Fusion and E.G.O Gifts

It is that time of the season again, where we have a new Mirror Dungeon. This means new mechanics, new fusion recipes and new E.G.O gifts.

Today, we shall look at some of the changes we would get. In all sections, we would have code available at the docs.

Upgrade Costs

The cost of E.G.O gift upgrades has been drastically reduced, after the hotfix.

Tier	1st Upgrade	2nd Upgrade
1	50	100
2	60	120
3	75	150
4	100	200
5	120	240

Fusion Outcomes

The main difference here is that we can now fuse Tier IV E.G.O gifts. There is now a point system for tiers.

Let us recall how fusion works:

1. You first pick a particular keyword. (e.g. Bleed, Poise)
2. You select E.G.O gifts for fusion
3. The outcome of fusion is determined as follows

First, the tier of the new E.G.O gift is entirely dependent on the tiers of the E.G.O gifts you put in. For convenience, we’ll use arabic numerals rather than roman numerals for tiers.

First you tabulate the points of the E.G.O gift you put in.

Tier	Points
1	3
2	6
3	10
4	15
5	30

The outcome is entirely then determined by total points you put in.

Eventual Tier	Total Points	Super Shop
1	≤ 10	≤ 9
2	11 - 16	10 - 14
3	17 - 24	15 - 21
4	≥ 25	≥ 22

The probability of you rolling the keyword is only dependent on the number of E.G.O gifts you put in.

Number of Gifts	Probability
2	60%
3	90%
4+	99%

Note that you can only fuse recipes that are available in the current theme pack, and is guaranteed to be an E.G.O gift you don’t previously already own. (This is from testing, but as it is not possible to prove a negative, do notify me if you have found a counterexample.)

• You cannot attain any E.G.O gifts you already own, including the fusion materials.
• If there are no E.G.O gift matching the Tier + Keyword combination, a random one of the same tier would be selected.
• If no E.G.O gift of that Tier is available, a random fusion and sale only E.G.O gift is chosen.

We already note the existence of Super Shops. They allow you to fuse up to 5 gifts (instead of the normal 3) and have discounted rates for higher tiers.

The rate of the Super Shop starts at 3%, and increases by 1% for every 20 cost spend in a shop. This can be from skill upgrades, rerolls, etc. In other words, the percentage is

$$\mathrm{min}\left(100, 3 + \left\lfloor\frac{\text{Spent Cost}}{20}\right\rfloor\right).$$

You can get a Super Shop, even on Floor 1.

Special Fusion Recipes

There are particular combinations of E.G.O gifts that yield special ones. These special fusions are always available, have higher priority to the normal fusion as stated above.

As this is a dynamically changing list. For the latest version, see this list.