This kind of request, Wen Yan naturally couldn't agree to, because he truly didn't have the ability.
When he was hanging onto a temporary ability in the past, he didn't know much about the deeper details, and was busy fighting with people, so of course he didn't think much about it. When he could use it, he'd use it promptly.
Later, he understood it was Grandma who added the buff, and during non-task periods, he could only add a buff under Grandma's watchful eye during his training.
Grandma never explicitly mentioned, but after a few times, Wen Yan roughly understood that Grandma's power wasn't something that could be used indefinitely and at will.
If it was during task execution, or a single time, then fine, there's nothing much to say.
But in the long-term, how could he have the qualifications to agree?
Today one person comes, tomorrow another; if everyone thinks it's effortless and foolproof, what if someone dies because the Blood Lock didn't work and they blame us?
