Unless something has changed recently, research skill maxes from lvl 16 to lvl 20 work like this:
lvl 16 - you can only put one point in at guildmaster: max at 16 skill
lvl 17 - you can only gain one point either by guildmaster or practicing: max at 17 skill
lvl 18 - you can only gain one point either by guildmaster or practicing: max at 18 skill
lvl 19 - you can only gain one point either by guildmaster or practicing: max at 19 skill
lvl 20 - max skill = (level - 15) x 5 = 25
lvl 21 onwards - max skill = (level - 15) x 5
Since when you train one point at your guildmaster, you get the number of skill equal to your level (i.e. 16 points at lvl 16 and 20 points at lvl 20), Old school researchers usually suggest people to refrain from putting in one point at guildmaster until lvl 20. Then you get 20 points for the same single training point. You can then max out the remaining 5 points via putting 5 more training points into it or by practicing.
Or course, this is old school mentality when every single training point is precious and should not be wasted. Nowadays, when training points are in abundance, most players may prefer to be able to research their own lvl 16 spells right away instead of waiting until lvl 20.
lvl 16 - you can only put one point in at guildmaster: max at 16 skill
lvl 17 - you can only gain one point either by guildmaster or practicing: max at 17 skill
lvl 18 - you can only gain one point either by guildmaster or practicing: max at 18 skill
lvl 19 - you can only gain one point either by guildmaster or practicing: max at 19 skill
lvl 20 - max skill = (level - 15) x 5 = 25
lvl 21 onwards - max skill = (level - 15) x 5
Since when you train one point at your guildmaster, you get the number of skill equal to your level (i.e. 16 points at lvl 16 and 20 points at lvl 20), Old school researchers usually suggest people to refrain from putting in one point at guildmaster until lvl 20. Then you get 20 points for the same single training point. You can then max out the remaining 5 points via putting 5 more training points into it or by practicing.
Or course, this is old school mentality when every single training point is precious and should not be wasted. Nowadays, when training points are in abundance, most players may prefer to be able to research their own lvl 16 spells right away instead of waiting until lvl 20.

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