The European Council sets the impetus of the EU.
Treaty change is made here too.
How are decisions taken in the European Council?
Is it unanimity?
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It depends on the decision being made.
Most decisions are made by consensus. If a vote is required by the treaties, then the decision will be made either by Qualified Majority (16 states representing 65% of the population), or unanimously, depending on what the treaties require for the particular decision.