These changes to Tahm would balance him

1. If an opponent spell shields or otherwise avoids devour, it should go on cooldown. The functionality to not go on cooldown vs immune monsters should not extend to players.
2. If an opponent uses QSS, oranges, or some other method to be dropped early, they should also avoid the damage from devour.
3. Stunning an opponent should remove acquired taste the same as devouring them - Tahm should not get a free 4-second CC once a player is 3-stacked.
4. Tahm's grey health shield needs to grow in effectiveness with rank: 30/45/60/85/100% conversion instead of 100% at all ranks

At the same time, there are some QoL changes Tahm also needs to be more user-friendly:

1. Priority for devour if multiple legal targets are under cursor: 1) 3-stack enemy champions, 2) allied champions, 3) minions/monsters
2. His bubble shield needs to be more responsive. There is a tiny delay where Tahm can hear the sound when using the ability but still due from damage before the shield activates. It should be instant.
3. His tongue lash should hit targets that are inside of his hit box. Frequently units get spat out directly under Tahm. Then, even if he is auto-attacking them, he cannot hit them with Q.
4. Spitting minions/monsters with W still bugs out if you spit them too soon after devouring them (it drops the unit at Tahm's feet instead of firing it as a projectile.