Is Cosmic Invigoration damage individual "ticks" or one "lump" of damage?

[Matthews1802]

If i use Cosmic Invigoration on an allied modal does the damage incurred from the Hit, Crit or Wild triggers all happen at once or are they individual "ticks" of damage ? 

For example: if i roll two hits in that roll would i take two damage or two lots of one damage ? 

[Thoras]

This would be one source of damage, so a single instance of two damage