Isaac can unlock Riissa by opening the door of Tracer's storage room with a red key. Riissa only has eight prop slots. When the game generates a prop, an extra prop option will be generated for the prop in the current room. Although Riissa has only eight prop slots, it is an extremely powerful character.

I. Characteristics

1. This character has 8 prop slots. Press the switch key to switch the prop position.

2. Whenever a character picks up props, if the prop slot is not full, it will occupy a prop slot. If the prop slot is full, it will replace the props that have occupied the prop slot at present.

3. Whenever the game generates a prop, it will generate an additional prop option for the prop pool in the current room.

Second, the gameplay

1. After picking up the props that can form a suit, the fallen Isaac can still form a suit with other props even if it is replaced later.

2. The attribute promotion of void is very beneficial to Isaac's fall, and attribute promotion can be obtained by absorbing unnecessary or replacement props.

3. Because Eliza can choose one from the prop pool in the current room every time she chooses props, the probability of encountering good props is much higher than that of other characters.