Importance of Athene's Unholy Grail
I'm new to this game and i play support . Well i see this item 
i dont actually understand what it does and how can i utilise it . If someone could help me with this , i'd really appreciate it . Thanks
3 Comments
I don't want to be too specific because there's a minor rework of this item on the PBE, and will likely change in the next patch.
The general idea is that it's suppose to be a good item for a champ that does a mix of Damage and healing/shielding. The tricky part is that it's difficult to find both on a support. I kinda feel like this item works better on a utility mid laner than a support, or even a carry AP that has one heal/shield. Though one niche case for this item, it can give a healing effect to a champ that has none, but does have shields.
It's good if you have a support that does damage and has a heal or shield in their kit. You want to do damage and charge it up, then use your heal or shield on an ally to discharge it and heal them.
Breaking it down into how it functions: Dealing damage fills up the grail (up to a cap) When you shield/heal an ally it also heals that ally using the charges in the grail. It can't heal yourself.
It is a good option on champs that do a mix of damage/defense. Someone like Karma, who does a lot of poke damage, but also has a shield, can pick up the item to give their ADC a bit of healing in lane. Lulu does a similar role and also has shield so she can pick it up.
Someone like Janna, who has shield but doesn't do a lot of damage doesn't pick it up because she can't fill up the grail very easily. Someone like Alistar, who has a lot of all in and one heal usually doesn't pick it up because he can't consistently fill it up (long CD's, doesn't poke much) and can't consistently proc it because his heal is part of his passive, not something he controls.
It is a pretty niche item that appeals to shielders/healers who like to get into the fray. It has some changes on the PBE that make the item scale a bit throughout the game by giving AP as you build other items with mana regen (Like Redemption and Ardent Censor), this makes champions that build heal items and use AP want to pick it up a bit more as it used to not scale very well out of lane.