First burger gives you a +2% chance of spawning when you kill an enemy. Every burger after that gives you +1%.
Formula:
$$chance ( 𝑛 ) = ( 𝑛 − 1 ) \cdot 0.01 + 0.02 = 0.01 𝑛 + 0.01$$
So:
| Stacks (n) | Chance field | Actual % spawn chance |
|---|
| 1 | 0.02 | 2% |
| 2 | 0.03 | 3% |
| 3 | 0.04 | 4% |
| 4 | 0.05 | 5% |
| 5 | 0.06 | 6% |
| 10 | 0.11 | 11% |
| 20 | 0.21 | 21% |
Multiple borgers will also (sometimes) increase the amount of healing you do. But it depends on your max hp. A burger will at minimum heal you for 8% of your max HP. But each copy of the burger also gives you a "flatHeal" of +2hp gain. If this is less than 8% this will not increase the hp you gain. Here's exactly how it works:
$$flatHeal = 8 + (2 \times numberOfBorgars)$$
$$heal=max(0.08 \times maxHP, 8+2 \times Borgars)$$
A practical example of how this works can be seen below
How many Borgars do you need before Borgar heals MORE than 8%?
Example 1 (Max HP = 100)
8% of 100 = 8 HP
| Borgar stacks | flatHeal | Actual Heal |
|---|
| 1 | 10 | 10 |
| 2 | 12 | 12 |
| 3 | 14 | 14 |
=> Because 8% of 100 is only 8 HP, even 1 Borgar already heals more than 8%.
You ALWAYS heal the flatHeal here.
Example 2 (Max HP = 500)
8% of 500 = 40 HP
| Stacks | flatHeal | Actual Heal |
|---|
| 1 | 10 | 40 |
| 5 | 18 | 40 |
| 10 | 28 | 40 |
| 20 | 48 | 48 (finally higher than 40) |
=> You need 20 Borgars before the heal is greater than 8%.
Example 3 (Max HP = 1000)
8% of 1000 = 80 HP
| Stacks | flatHeal | Actual Heal |
|---|
| 1 | 10 | 80 |
| 10 | 28 | 80 |
| 20 | 48 | 80 |
| 30 | 68 | 80 |
| 36 | 80 | 80 |
| 37 | 82 | 82 |
=> You need 37 Borgars to exceed 8%.
Example 4 (Max HP = 10 000)
8% of 10 000 = 800 HP
| Stacks | flatHeal | Actual Heal |
|---|
| 1 | 10 | 800 |
| 100 | 208 | 800 |
| 200 | 408 | 800 |
| 300 | 608 | 800 |
| 400 | 808 | 808 |
=> You need 400 Borgars to heal more than 8% here.