do you need lair keys to open the end chests in the coil?

[signal falcon]

been wanting to do coil but i need a lot of lair keys and im pretty sure lair keys drop from the end chests from coil so i was just wondering if the chests were a good way to farm lair keys

[sleek silo]

you shouldn't need keys, they will just improve the rewards

[signal falcon]

can you still get red borders without the key?

[covert geyser]

You can, but you should have a stockpile of keys if you play the game

[oblique comet]

The keys improve your rewards, they don't lock them. You'll get a couple free chests and a chest that can only be used with a key.