I may have just come up with the ultimate Juggernaut Keystone
Rush of the Titan
After being damaged for 30% of your HP within 5 seconds, gain 10-70 movespeed and 15-40% tenacity up to 15 seconds or until leaving combat.
Obviously it's in resolve.
EDIT: it could also be, as pointed out below by the commenters, a slightly higher amount of speed, capping at 10 seconds instead of 15.
EDIT2: or, much less abusably, after being damaged for a flat amount scaling with level like
rather than a % of your health.
's speedboost,
speedboost,
speedboost,
, movement speed quints,
,
active,
ult AND rush of the titan passive to get to the enemy ADC
shield and
speed boost is already bretty op.
: You can't stop my Thanks!!!
). It's really just Garen who gets screwed, but he has above average tankiness and burst.
would actually be meta with this tho)