When you have baron and stand near minions they become empowered. SSometimes the casters one will not be buffed and stay normal between he other empowered minions.
1/ Kill Baron Nashor
2/ stand near a wave of creeps (happened to me my 2 last games where i did baron as jungler
PS: on the screen we see the casters not empowered and the last empowered melee minion under tower
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