Companions

Companions (also known as Legendary Keepsakes) are items that can be equipped to obtain a unique summon ability per run. After giving 5 to 6 Nectars to the appropriate person, their Affinity Gauge in the Codex will show a heart with a keyhole, indicating that you need to earn their favor (by deepening your relationship with them or assisting them in some way) to progress further. After earning their favor, companions can be acquired by giving them Ambrosia for the first time.

All companions:


 * Can be equipped in the courtyard's display case before a run. Unlike Keepsakes, Companions may not be changed mid-run after defeating the final boss of a biome.
 * May be upgraded using Ambrosia at the display case or a Keepsake Collection, Regional (purchased at the House Contractor) after a boss fight.
 * Have a maximum number of uses per escape attempt (from 1 to 5, depending on upgrade level). The maximum may be exceeded by buying a Night Spindle from the Well of Charon.
 * May be used once per encounter (chamber with combat).

Upgrades
When a companion is first received, it can be summoned once per escape attempt.

Each upgrade level increases the maximum number of times a companion may be used per escape attempt by one. If upgraded mid-run, the maximum number of uses will increase in the current run.

Fully upgrading a companion costs 10.

Summons vs Hades
At first, only Shady and Rib may be used against Hades. However, once you have forged a sufficient bond with him and a few others, he will grant you authority to use any of the companions against him.

This authority requires:


 * 4 hearts with Hades
 * 7 hearts with at least 2 of the following: Megaera, Thanatos, Dusa, Achilles, Skelly, Sisyphus
 * The above must include one of the following: Megaera, Thanatos, Dusa, or Achilles