last game i played Tahm Kench 
. i had a diana 
in my team. in order to prtect her i tried several times to eat her with W but it didnt work. i tried it with all teammates and the enemy team. i could eat everyone but i was not able to eat Diana.
Stellafreyja1 votes "Knock knock."
"Who's there?"
"The moon...It's far away...You were alone the whole time! Hahaha!"
JaneKaka1 voteshaha lol. no seriously its a bug,,, hope they fix it soon. i wanna eat my sweet diana
Nokuni1 votesUP ! This bug was in my ranked soloQ, i played Tahm Kench support with my ADC Caitlyn. At the start, i could eat her. But i don't know how, in mid-game, i tried to eat her but nothing. She was like immune to my Devorer.