New spell to heroes and another idea

Spell Heroes.

This spell is used on the heroes. the spell returns to hero a percentage of their life and for a short time, for example 5 seconds, increased attack and speed. In addition, improving the spell also get one second of invisibility, enough for defenses aimed at another target. The spell would be available to th9, or include it in th7 without being very decisive. This spell would add no power to the skill of the hero, as with the spell Rage, and it could have different statistics for each hero.


th7 available statistics:


spell level: 1 (th7) 2 (th8) 3 (th9) 4 (th10) 5(th10)
cure rate: 10% 12% 14% 15% 16%
increasing attack: 40 50 70 90 100
speed increase: 8 10 12 14 15
time invisibility: 0 0 0 0 1


th9 available statistics:


spell level: 1 (th9) 2 (th9) 3 (th10) 4 (th10)
cure rate: 12% 14% 15% 16%
increasing attack: 55 70 90 100
speed increase: 9 11 13 15
time invisibility: 0 0 0 1





2 spells acceleration

My other idea is to combine two spells acceleration. 4 spells earthquake can destroy any wall, and the idea would be similar, join two spells to get a bigger result.
The result would be faster, but a much larger area. if a spell of acceleration has a radius of 4, and the rage of 5, joining two spells acceleration we could get a circular area of radius 8. the area of a circle of radius 8 is much greater than two circles of radius 4.
the larger circle and the time would be from the first spell, to enable this improvement would have to take the second spell of acceleration in the first, but the power would end when the time runs out first, so that should be used very followed.