Barrier occupies too much of the same space as heal and needs to be changed

Currently Heal and Barrier function too similarly. I propose making barrier a shorter duration than 2 seconds, but that ALL damage is blocked for the duration- hence a true "barrier".

This spell would then be a better counter to burst, assuming a player was good enough to anticipate when to use it.. Additionally it would serve a function that Heal does not, making two freshly distinguishable summoner spells! :-)