Check https://discordapp.com/download

Review the versions and use:

curl -vs "https://discord.com/api/download?platform=linux&format=deb" 2>&1 | grep '< location: ' | grep -o 'https://.*'
wget -q "https://discord.com/api/download?platform=linux&format=deb" -O discord.deb
wget -q https://dl.discordapp.net/apps/linux/0.0.9/discord-0.0.9.deb

curl -vs "https://discord.com/api/download/ptb?platform=linux&format=deb" 2>&1 | grep '< location: ' | grep -o 'https://.*'
wget -q "https://discord.com/api/download/ptb?platform=linux&format=deb" -O discord-ptb.deb
wget -q https://dl-ptb.discordapp.net/apps/linux/0.0.14/discord-ptb-0.0.14.deb


After download, rebuild the package to avoid bad dependency:

$ rebuild-package discord-0.0.9.deb discord-0.0.9-eclipxe1.deb