Choose a willing creature that you can see within range. Until the spell ends, the target's speed is increased by a multiplier of x2 (doubled), it gains a +2 bonus to AC, it has advantage on Dexterity saving throws, and it gains an additional action on each of its turns. That action can be used only to take the Attack (one weapon attack only), Use a Spell, Dash, Disengage, Hide, or Use an Object action.
When the spell ends, the target can't move or take actions until after its next turn, as a wave of lethargy sweeps over it.
At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, you can increase the AC bonus by a +1 for each spell slot above the 3rd or for every 3 spell slots above the 3rd, you can either target one additional creature or expand the duration of the spell by one minute or increase the target's movement by increasing the speed multiplier by one (x3, x4, etc). If the spell is casted at a higher level with additional effects and with an additional target those effects are present also to the extra target.
Example: Casted at 9th level, its 3+3 levels above the 3rd so the duration can be 3 minutes or 2 minutes with an additional target or 2 minutes with the speed tripled or 2 minutes with an +5 AC or 1 minute with 2 extra targets or 1 minute with an +8 AC or 1 minute with the speed tripled and one extra target or 1 minute with the speed quadrupled, etc.