Xanders said:

Buffs/debuffs in-game description?

Is it hidden somewhere or just absent?

I.e. for the new one - "Poison Sensitivity" had too search net for what it does, etc.

If it is not in game - any official resource with up-to-date info on it?

Thanks!

Try this.

It's not "offitial" but it is up to date, reliable enough and well organized. 

Xanders said:

Buffs/debuffs in-game description?

Is it hidden somewhere or just absent?

I.e. for the new one - "Poison Sensitivity" had too search net for what it does, etc.

If it is not in game - any official resource with up-to-date info on it?

Thanks!

Try this.

It's not "offitial" but it is up to date, reliable enough and well organized. 

Here's another useful resource: https://www.inteleria.com/buffs-and-debuffs-list/

You can select any buff or debuff and you'll find a list of Champions that apply it, as well as the skill descriptions in-line for ease of use. There's also one for Instant Effects.

Disclaimer: I operate the Inteleria service :)