2 added 1 character in body
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Solo

Tabaxi Race (Volo's guide) - 30

5 Barbarian for Fast Movement (PHB) - 10

Elk Totem (SCAG)- 15 (while unencumbered)

5 Monk for Unarmored Movement (PHB) - 10

6 Transmuter Wizard for stone (PHB) - 10

Lvl 1 spell: Longstrider (PHB) - 10

Mobility feat (PHB) - 10

Major artifact with speed (DMG) - 10

Boon of speed (DMG) - 30

Total = 135

Tabaxi Feline agility (Volo's guide) - x2 speed for 1 turn (resets on not moving a turn)

Boots of speed (DMG) - x2 speed for 10 minutes after bonus action

Lvl 3 spell: Haste - x2 movement speed

135 x 2 x 2 x 2 = 1080

Lvl 3 spell: Haste: Dash action - +100% movement

2 Rogue for Cunning action: Dash - +100% movement bonus action

2 Fighter for Action Surge: Dash - +100% movement

Standard Dash action - +100+100% movement

1080 x 5 = 5400ft for 1 turn, or ~614mph

If you have help from a transmuter wizard, cut out the 6 wizard levels and give them to Monk for an extra 10ft base, or 80ft per move for an extra 400ft, or 5800ft in one turn

Solo

Tabaxi Race (Volo's guide) - 30

5 Barbarian for Fast Movement (PHB) - 10

Elk Totem (SCAG)- 15 (while unencumbered)

5 Monk for Unarmored Movement (PHB) - 10

6 Transmuter Wizard for stone (PHB) - 10

Lvl 1 spell: Longstrider (PHB) - 10

Mobility feat (PHB) - 10

Major artifact with speed (DMG) - 10

Boon of speed (DMG) - 30

Total = 135

Tabaxi Feline agility (Volo's guide) - x2 speed for 1 turn (resets on not moving a turn)

Boots of speed (DMG) - x2 speed for 10 minutes after bonus action

Lvl 3 spell: Haste - x2 movement speed

135 x 2 x 2 x 2 = 1080

Lvl 3 spell: Haste: Dash action - +100% movement

2 Rogue for Cunning action: Dash - +100% movement bonus action

2 Fighter for Action Surge: Dash - +100% movement

Standard Dash action - +100 movement

1080 x 5 = 5400ft for 1 turn, or ~614mph

If you have help from a transmuter wizard, cut out the 6 wizard levels and give them to Monk for an extra 10ft base, or 80ft per move for an extra 400ft, or 5800ft in one turn

Solo

Tabaxi Race (Volo's guide) - 30

5 Barbarian for Fast Movement (PHB) - 10

Elk Totem (SCAG)- 15 (while unencumbered)

5 Monk for Unarmored Movement (PHB) - 10

6 Transmuter Wizard for stone (PHB) - 10

Lvl 1 spell: Longstrider (PHB) - 10

Mobility feat (PHB) - 10

Major artifact with speed (DMG) - 10

Boon of speed (DMG) - 30

Total = 135

Tabaxi Feline agility (Volo's guide) - x2 speed for 1 turn (resets on not moving a turn)

Boots of speed (DMG) - x2 speed for 10 minutes after bonus action

Lvl 3 spell: Haste - x2 movement speed

135 x 2 x 2 x 2 = 1080

Lvl 3 spell: Haste: Dash action - +100% movement

2 Rogue for Cunning action: Dash - +100% movement bonus action

2 Fighter for Action Surge: Dash - +100% movement

Standard Dash action - +100% movement

1080 x 5 = 5400ft for 1 turn, or ~614mph

If you have help from a transmuter wizard, cut out the 6 wizard levels and give them to Monk for an extra 10ft base, or 80ft per move for an extra 400ft, or 5800ft in one turn

1
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Solo

Tabaxi Race (Volo's guide) - 30

5 Barbarian for Fast Movement (PHB) - 10

Elk Totem (SCAG)- 15 (while unencumbered)

5 Monk for Unarmored Movement (PHB) - 10

6 Transmuter Wizard for stone (PHB) - 10

Lvl 1 spell: Longstrider (PHB) - 10

Mobility feat (PHB) - 10

Major artifact with speed (DMG) - 10

Boon of speed (DMG) - 30

Total = 135

Tabaxi Feline agility (Volo's guide) - x2 speed for 1 turn (resets on not moving a turn)

Boots of speed (DMG) - x2 speed for 10 minutes after bonus action

Lvl 3 spell: Haste - x2 movement speed

135 x 2 x 2 x 2 = 1080

Lvl 3 spell: Haste: Dash action - +100% movement

2 Rogue for Cunning action: Dash - +100% movement bonus action

2 Fighter for Action Surge: Dash - +100% movement

Standard Dash action - +100 movement

1080 x 5 = 5400ft for 1 turn, or ~614mph

If you have help from a transmuter wizard, cut out the 6 wizard levels and give them to Monk for an extra 10ft base, or 80ft per move for an extra 400ft, or 5800ft in one turn