Keystone mastery discussion aka "The Thunderlord's Problem"

Currently we have 9 keystone masteries.

Warlord's Bloodlust - For crit-based champions, mostly adcs. Fervor of Battle - For champions that auto enemy champions a lot and often. Deathfire Touch - For champions with specific interactions with it, that harass often enough with abilities to be gated significantly by Thunderlord's' cooldown, or have difficulty setting off Thunderlord's consistently.

Stormraider's Surge - For... some champions. They'd need to be able to deal a fair amount of damage in a short amount of time, then make use of the movement speed it grants. Thunderlord's Decree - For everyone that can pull off three hits in a short period of time. Windspeaker's Blessing - . An option for and some self-healing champions who don't need damage and wouldn't rather have something in the resolve tree.

Grasp of the Undying - For champions who intend to stay in combat for extended periods of time, particularly those that build a lot of health. Strength of the Ages - For champions who want a bit of bonus HP and sustain Bond of Stone - For champions who stick around other champions a lot and need to be able to take a hit, particularly for them. Mostly for tank supports.

Okay, so, for an adc that builds crits we have Warlord's bloodlust, Deathfire Touch and Thunderlord's. Warlord's Bloodlust is nice and all but it doesn't actually offer you any damage, and if you have any kind of multihit you can set off Thunderlord's pretty easily by comparison. Deathfire Touch only activates on abilities, so that's off the table for almost all of them.

Now, for adcs that don't build crits we have Fervor of Battle, Deathfire Touch and Thunderlord's Decree. Once again Deathfire Touch is extremely niche among adcs, so we can ignore it. Fervor of battle only applies when attacking enemy champions, so... Ashe? Great, so Ashe can take Fervor, and everyone else will take Thunderlord's because the activation requirements and usage requirements are bad but have little overall payout to boot. Actually, now that I mention it, Ashe would probably get more damage out of Thunderlord's, wouldn't she?

Now time for assassins. Thunderlord's. The end. I dunno maybe being able to run away with Stormraider's surge is an option, but even then it doesn't make the best escape in and of itself, even with the upcoming buff. Most assassins are squishy and have have some method of escape already. I can see it being handy on Rengar or something. but even then it causes their playstyle to lean more towards feast or famine, (great to have or almost useless to have) whereas Thunderlord's will consistently help them do things either way.

Now time for Mages. They have either Deathfire Touch or Thunderlord's. What mage wants Stormraider's when the AP itemization puts their ability to put out enough damage in jeapordy to begin with? Even on Vladimir, who has damage and really needs movement speed, I'd rather just take Deathfire and build a Rylai's.

Now Fighters, Tanks and Juggernauts. I don't quite get the appeal of Strength of the Ages. So you get a free Ruby Crystal and a half, and after that if you stay in lane you'll heal a minor amount every time a siege minion rolls around. I don't see the appeal at all. The few it could apply to- passive enough not to want Grasp of the Undying (incredibly passive, as even Janna would prefer Grasp over Strength imo) but solo enough that they wouldn't want Bond of Stone- probably prefer a damaging keystone anyway. What do they turn to when they want damage? Melee, no crits, no synergy with Deathfire.

THUNDERLORD'S~~~

What's left? Supports? Bond of Stone or Windspeaker's. What's that? You want to have damage as a support? Your name isn't Brand either?

Can you get off three hits?

YOU GET A THUNDERLORD'S, YOU GET A THUNDERLORD'S, EVERYONE GETS A THUNDERLORD'S UP IN THIS BITCH.

In conclusion, League of Thunderlord's is because the keystone masteries failed to meet its stated goals of offering meaningful decisions, and isn't necessarily because Thunderlord's is overpowered and/or needs to be nerfed.