deathfire touch

some poeple using this keystone on riven wich is totally useless and here is why :

1. rivens ablitys are aoe.. so u do not 50 % u do 25 % bonus ad over 1,5 seconds...

2. it turns bonus ad into magie dmg... u dont have magie pen as riven.

3. rivens basic combo q-aa-q-aa-q-aa goes faster then 1,5 sec between each combo... so it means u don t even do the dmg in 1,5 seconds.. it just breaks the dmg and refreshes if you understand what i mean...