When playing as a crystal power Lane Adagio, be sure that you are maximizing your last hit potential and rotate rarely. Use your gift of fire to light the enemy hero on fire when they come close to your minions. Ensure that you are clearing your minions at the same rate as the enemy carry and you should be fine. Consider pushing the lane the instant you are able to afford your Alternating Current as it will make last hitting easier. If you are having trouble last hitting with your Alternating Current, when your alternating current is off attack the large minion and then use the empowered attack to last hit. Generally you will not be the one who you light on fire, unless you are being ganked. Consider telling your allies to pick a jungle or a support that dives in on the enemy team. When you decide that you are ready to battle, ensure that you land your Arcane fire on an enemy hero then use agent of Wrath on yourself and dish out your empowered attacks. Remember that your defense can be adjusted to face the enemy team you are against, if your other team has two weapon power heroes consider getting double defense. Always ensure that you are keeping up your last hitting regardless of how late the game gets. The important thing is to make sure you stay far back in the lane, freeze the lane and completely dominate the other laner.
If you are against a laner with good harass like:
Samuel
Skaarf
Celeste
Consider acquiring boots earlier than usual.

When laning against a powerful enemy junlger like:
Glaive
Taka
Koshka
Joule
Either play farther back, or acquire a scout trap at the start.

When playing jungle Crystal Adagio, be very careful and avoid early confrontations. When compared to almost every other jungler your damage is very much weaker until you get your alternating current and some defense. In general you should stay in the jungle and focus on clearing your rounds if the enemy junglers do not take the tree and you may attempt it but if they try to contest it immediately give up. Especially against an enemy jungler such as Glaive or Rona you must be even more careful. I cannot stress this enough do not contest the central camp. In some cases ignoring it and focusing on going through your jungle can actually healed you for Minion kills because they are so focused on defending it as opposed to clearing their jungle. In general your gank ability is weak, unless you have a support such as Catherine, avoid any serious gank attempts. Often times you will find that your damage is weak, you are primarily a hero that will be beneficial during team fights do not worry about your seemingly low damage output by the time you are Level 7 you should have acquired a Reflex Block to prevent you from being stunned during your ultimate channel. As you reach the period of time between 15 and 20 minutes you will be most effective, to a certain extent consider pushing your talents and abilities to the max as your damage will fall off the further you get into the game. In general your focus should be avoiding confrontation unless it is a large team fight and you possess your ultimate ability.

When playing as a weapon Adagio getting the jump on the other team and staying ahead on last hits is crucial. If you seem to find that you are not doing enough damage it is likely because you do not have sufficient minion kills to afford good items. This makes for a tricky balance as Adagio is best when he is shopped recently so you must find a way to push the lane, then shop then make sure you get everything again. You will find it that enemy Heroes such as Ringo or weapon Vox have more damage than you that is primarily early and late game, in the middle you may find that you are dealing more damage than them. Typically your skills are not worth using unless you require only one attack and you need to use your agent of Wrath. The one ability you should use is your ultimate and you should only use that if everyone on the other team is on your arcane fire and they are grouped up, barring that you should never use your skills. As usual you should generally avoid rotate in and do your best to stay alive in the lane. Like mentioned in the Crystal Lane build when you are against a powerful crowd control jungler, you could get Vision to either start the game or buy it when you first go to the Jungle shop. Staying Alive is crucial to maintaining your last hits, one death could cost you ten minion kills even more if you get later into the game. I recommended pairing you with a tanky crystal jungler, as it will make it easier for you to build up Stacks against the enemy Heroes while they are focusing your teammate. In general you should Target enemy damage dealing heroes, but if you see the support running by himself consider using a lot of your attacks to build up breaking points before the fight starts. To summarize focused on last hitting, staying alive and dishing out damage without using your skills.

As a jungle weapon Adagio be sure that you use your long-distance attacks to harass the enemy jungler is when they have to take the central camp. Damage may be small compared to other heroes early game but you can keep at a distance to ensure that you deal more damage in the end. In general your ability to gank the enemy later is pretty weak, so you should focus on maintaining a jungle presents and clearing your rotations at maximum speed. You will find that enemy heroes who are better at leaping into the fray are going to be much more successful at killing you, so you might want to be paired with a support who can push the enemy heroes away such as Lance. Given the chance you should shop after every jungle rotation, but before it reaches 4 minutes you should not be shopping. Similar to how you play the lane you should be very wary about dying, as it can hurt you even further in the rest of the game. Regarding the tree ent in the center, you should not ever be the one to take its damage. Oftentimes the other team will be so focused on stealing it that you can clear your entire jungle before they start there's and once they do that you may have an open chance to take it. Consider leaving your support to watch the tree ent if your support has a reliable escape, you will then go take your jungle and if he sees the other team attempt to take it, you can go help. The trick to playing a jungle Adagio is similar to Lane and that is that you can't die, and you must maintain good standing on your items and last hits.

Heroes to avoid:
Rona
Glaive
Flicker
Petal
Alpha

Heroes to pair with Adagio:
Lance
Phinn
Ardan
Skaarf
Samuel

When playing Adagio as a support you should rarely use your second ability, agent of Wrath. Because your gank ability is weak, you should stay in the jungle and focus on completing your rotations as fast as you can. When the game starts, you should upgrade your gift of fire, but generally avoid using it outside a fight, as in some cases it may steal minion kills from your jungler. However, if you have a jungler that takes a significant amount of time to clear your jungle you may want to use it in between camps or when he or she is just about to start a camp with two creatures in it. In some cases you can use your heal on yourself to make it easier for you to clear tree ents. Regarding the central tree ent, you should rarely contest it unless the other team is completely ignoring it. You should acquire energy regeneration pretty early if the enemy team is constantly pressuring your lane. As an alternative to ganking, occasionally come up to the lane and use your gift of fire on your allied carry to keep them in the lane for a longer period of time. As the game progresses you should become more reliant on cooldown reduction and your ability to heal your allies. After this point you will need to have an ally or you rush into the enemy team so that you can light them with your gift of fire, and channel your ultimate.
Adagio pairs well with Heroes such as
Rona
Glaive
Alpha
as they can get into the enemy team very quickly.

Recommended ally laners include:
Celeste
Skye
Skaarf
Ringo