League of Legends: Dominion center map buff (Storm Shield)

Alright, I pulled these up with a LoL Replay of a Dominion game.

Bonuses Granted:

The character model grows by roughly x2

The first grants an absorption shield with 212.5 (+12.5 x level) health that will recharge if the champion doesn't receive damage after 10 seconds.

The second buff allows the champion to passively detonate a lightning blast inflicting 90 (10 x level) magic damage on the champion's autoattacks and damaging spells with a 4 second cooldown. Spawn Time: 3:00 Minutes

Channel Time: 5 seconds

Respawn Time: 3:00 Minutes

Duration: ~45-60 Seconds (Not positive on this one, hard to find a game where someone kept it the whole time.)

Source: League of Legends Wikia