cant be the target of spells or abilities, magic the gathering question?

i have a plated slagwurm in play it says "plated slagwurm cant be target of spells or abilities your opponents control" my opponent has a wojek embermage it says "tap: wojek embermage deals one damage to target creature and each other creature that shares a color with it" he targeted another creature i have, does it still do damage to my slagwurm? (both creatures of mine are the same color)
and im guessing obliterate effects it as well?
 
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