I play in a non-English meta, and none of the players agree with me
thast Donal's effect is unlike Cam Exemp or Archon.
I know you do not burn for blocking Donal, but need official
confirmation please from the big guy.
That's right.
Card text would help.
Camarilla Prince of Dublin: Any vampire blocking D�nal
burns 1 blood (before combat begins, if any).
The "before combat begins" is a huge context clue that
you only burn blood when the block is successful.
Correct. Also the text "Any vampire blocking Donal" (not "attempting
to block Donal").