Is the Void/Sentry synergy good?

Narwhal52xNarwhal52x Posts: 513 ★★★
I have a 4* duped Void 4/40 and I just got a 4* Sentry. Should I rank up my Sentry to be as good as my Void to use the synergy? Or is the synergy nothing special and doesn't need to be used?
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