Mages are the primary users of mana, practically being useless without their spells. Tanks and carries rely much less on it but always find it useful to have their skills available. Mana is a statistic not always kept in mind when making a build unless the champion relies on its intensive use. That is the case of Anivia abusing Glacial Storm or Karthus having Defile always on.

Whether you are building Kog’Maw as a Living Artillery mortar or a Kassadin that teleports instead of walking you will need lots of mana. The following table shows the items that provide mana and their cost effectiveness: the cost of each unit of mana. Let’s click on the last header and see what the sorted table reveals.
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Mobility is a great asset for any champion in League of Legends. A highly movable champion will be able to assist accross lanes and return to the fray faster. Walking time is wasted time, so whatever diminishes it is worth considering.

Items that increase movement speed (MS) can be divided in two categories: boots and other items. Boots increase MS by a flat amount while other items increase it by a percentage. To see which items provide the highest increase to MS for the least gold we’ll check their cost effectiveness: cost divided by the boost provided. The cost effectiveness is the cost of each unit of the boost: one MS or 1% bonus MS.
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Cooldown reduction (CDR) is a very useful statistic in League of Legends and also one of the most difficult to boost with items. The problem originates with carries demanding huge quantities of attack damage (AD) and mages ability power (AP). Items that are effective as pure AD or AP boosts don’t provide CDR while items that do provide CDR give small amounts of AD or AP; if any.

All champions benefit from being able to use their abilities more often. Therefore, an analysis of items that provide CDR will help in determining what items with a CDR bonus help carries, mages, tanks and support perform their role.
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Carries’ most important stat is attack damage (AD). Attack speed (AS) is an important stat also, but usually is secondary to AD as it doesn’t improve skill damage and its effectiveness is based on AD itself. Critical strikes (CS) shares a lot in common with AS, as it can be considered a secondary stat for carries. Both AS and CS depend on AD but they can each double the damage output of a champion if properly built.

There are carries with a certain affinity to specific stats, for example Ashe with CS. In case of such a build it becomes useful to know which items give the most critical strike chance bonus per gold cost. The table below has all the items that boost CS with their gold cost and cost effectiveness. That is, how much each unit of the bonus costs in gold. Clicking on the last header we can order the table by cost effectiveness and make an analysis.
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Carries’ objective is to maximize their damage output and for that many statistics can be improved. If attack damage (AD) is the more direct, attack speed (AS) comes closely behind. Some champoins with powerful passives can benefit from AS, so as to trigger bonus damage or make the most of an extra effect to their auto-attacks.

In the table below are listed all items that provide an AS bonus. Clicking on a header sorts the table with that criterium. Cost effectiveness is obtained by dividing the gold cost by the bonus provided. Let’s see what surprises await after sorting.
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