You're missing a curly bracket here.
Code:
sub EVENT_SAY {
if(($text=~/hail/i) && (defined($qglobals{illsalin})) && ($qglobals{illsalin} == 0)){
$client->Message(5,"Have you heard of the new [tyrant] of Last World?");
quest::setglobal("illsalin","1","5","F");
}
elsif(($text=~/tyrant/i) && (defined($qglobals{illsalin})) && ($qglobals{illsalin} == 1)){
$client->Message(5,"His name is Vertallis, he is a monstrosity from another realm who subsides in the Caves of Time. He holds the key to the next realm of [adventure]...");
}
elsif(($text=~/adventure/i) && (defined($qglobals{illsalin})) && ($qglobals{illsalin} == 1)){
$client->Message(5,"Yes, the ancient Ruins of Illsalin. Deep within the ruins dwells creatures beyond any power you have ever seen...you must gain access to these ruins. One of adventurers went there several seasons back and has never returned...he could be alive. Poor Daemonloth...");
}
}