Stun spells (Polymorph, Sap, Fear, succubus Seduction and other)

It is due to [URL="https://www.getmangos.eu/issue.php?issueid=424"]implementation of Heartbeat Resist[/URL]. So, Polymorph fades off usually between 20th and 30th seconds, and sometimes faster. It was said it's blizzlike for Zero only.

A better formula to determine the timings is welcome.

Olion, he says on NPCs it also breaking before 10 seconds which is wrong. Heartbeat should only work for at players.
Maybe you didn't exclude NPCs from your heartbeat system?

Thank you. I was too glad for the SPELL_ATTR_HEARTBEAT_RESIST_CHECK spell attribute found recently by the TC team, and switched off involved unit type checks. It turns to be an error.

Since I introduced this bug, [URL="https://github.com/mangoszero/server/pull/35"]here[/URL] is the correcting PR.

P.S. However, the PvE heartbeat resist is a topic requiring research. AFAIK there exists some.