-R SKILL   If Io is interrupted during the ult channel, he loses it and it forever becomes "BREAK RELOCATE"
-R SKILL   If Io links, ults somewhere, then dies, his tethered ally returns to the original spot immediately. If io then ults somewhere, links someone, THEN returns, the non-io will go to the first link location it seems.
-Q SKILL   Tether seems to give mana when Overcharge is off, but if it is on it doesn't give mana?
-Q SKILL   Tether does not always give linked targets HP/MP even if Overcharge is active. Happens more often when swapping between many targets it seems.
-Q SKILL   If io teethers, ults somewhere, then dies, his tethered ally returns to the original spot immediately. If io then ults somewhere, tethers someone, then RETURNS, (assuming it's the same person), Io's Tether-target will go to the first "tether cast location" it seems.
-Q SKILL    While tethered, Io can get slowed
-Q SKILL   While tethered, Io does not stay at whatever movement speed his link target is at, especially if they go above 550. (RIP io + bloodseeker especially)
-D SKILL   Sometimes after death, the D skill doesn't swap between the two modes correctly.
-Q SKILL   If tethered target (or Io) breaks the tether, Overcharge will remain on the tethered target.
-W SKILL   Spirits increase enemy movement speed, instead of slowing them.
-Q SKILL   Tether does not display the Health/Mana Amp
-E SKILL   Procs Pugna Ward?
-Q SKILL   Tether does not specify what the -100 slow is for.