This guide has not yet been updated for the current season. Please keep this in mind while reading. You can see the most recently updated guides on the browse guides page
Your votes and comments encourage our guide authors to continue
creating helpful guides for the League of Legends community.
Rod of ages in general is just an all around great item for ap, mana based characters. I sometimes prolong getting the ionian boots if I wish to rush the rod. I chose to get the catalyst converter over the blasting wand first because the health+mana you gain from leveling really helps you stay in the lane for longer periods at that level.
Rylai's scepter is just such a useful item. It's great for increasing orianna's survivability and the slow helps both, escape from enemies with your w (or help your allies escape) and hunting fleeing champions down.
Archangel's staff was also included before Rabadon's due to the need to increase your burst damage. Orianna has the ability to deal out terrifying amounts of aoe damage, which is why I prioritize the AP over mana.
Once you sell off the doran's ring, the void staff is a pretty nice item to complete your set. At this point, Orianna should have over 3k health, over 5k mana, 450+ AP, and be a little terrifying. The void staff is the best magic penetration item you can get, and, if you've been playing orianna right, the other team should have some magic resist at this point.
Some tips for where to target:
Be aware of who's likely to be targeted first. Usually teams will immediately go for the carry (hopefully that will be you, but you'll be hanging back so that won't happen) or a feeder. In any case, watch for them to run up to that champion and act accordingly.
Look for their carries. Orianna's ult is great for disrupting a team fight and can keep a carry out of a battle for a second while you and your team dish out the damage.
Target the squishies. I don't know why, but for some reason I notice that squishy character like to stay close to each other during teamfights. It may just be me, but in any case, if you see it, feel free to immediately throw the ball at them and hit w and r. Orianna has such great burst damage that they should be at at least half health by that time.
Orianna's ball is godly for scouting. I cannot say how many times I have been saved by first sending my ball into a bush to check around and finding 3+ champions waiting for my mechanical butt. It has relatively low mana cost as you level up, so feel free to spam it for scouting. I have even stolen Baron with it once by sending it from the above cliff and ulting.