Hook to primal storm rare spawn chat message

[2BOnest]

Hi all,

I'm doing an aura for WeakAura that tracks when the chat says a boss of the primal storm has spawned such as "Gravlion is here!" since raretracker often doesn't trigger if I'm not in the proximity of the spawned boss.

The aura is ready and completed since I've tested for the word "is here!" in CHAT_MSG_SAY and it works. What I am unable to do is to hook to the actual channel that says "Gravlion is here!" since is not CHAT_MSG_SYSTEM and is a little darker yellow of the CHAT_MSG_SYSTEM (and also it pops like a raid warning).

Could it be a CHAT_MSG_BG_SYSTEM_NEUTRAL even if is not bg?

Attached the message and the channel color I'm speaking of (in the screenshot is "Il Trio Lama Gelida è qui!")

[2BOnest]

Using the default blizzard event trace pannel by typing

/eventtrace start

I've found the right channel, which is

CHAT_MSG_RAID_BOSS_EMOTE