Webauthn is soon here, and with it comes a passwordless future. The new FIDO2 standard alongside other hardware backed authenticators are replacing the old FIDO U2F that only had bindings in Google Chrome, promising great interoperability.
Please add support for FIDO2 authenticators for use with two factor authentication. The obvious way to implement webauthn in Discord would be by allowing users to add their tokens as a second authentication factor.
Currently there are only a few FIDO2 authenticators on the market, including the Yubico Security Key and the Yubikey 5 Series. It also seems that Touch ID and Face ID can be used with Webauthn on Apple devices. As the market develops, the higher assurance provided by webauthn can be utilised in more depth.
edit on 7.3.2019:
Google with the FIDO alliance recently announced that Android upwards from 7.0 will become 'FIDO Certified' through a Play Services update. This means that many many devices fingerprint sensors can soon be used for Webauthn authentication. The update also brings support for external authenticators, where applicable.