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Thank you all for your answers!
Seeing tour opinions, after talking to my group we've decided that we are gonna add the damage once chosing what type of damage gets the bonus.
One player argued that each "damage roll" should get its own bonus (not weapon runes, because they somehow "add" dices to a damage roll). However in the end even he accepted that it would be Too Good To Be True if the Psychic in the group added +38 damage to a Meteor Swarm so we settled using that ruling.