I helped a 63 smn grab this the other day, a LS mate. What a pain in the back end this was. You NEED to enter at the Den of rancore entrance is for sure to get the offering the fastest.
Even at 99 rdm its kind of a hassle to run around there. Tonberrys like nobody. The Idols agro to magic. So. you could end up in a endless fight.
Since every so often the smn would get agro, or the 90 pup would get agro. So this is what we decided to do.
The pup ran around got some agro. Brought them all to me. about 17 mobs. I sleep em all/ they start checking the rooms for the offering. I keep all agro and the growing crowd occupied. ( don't try this at home lol)
So I ended up running around checking rooms aswell. thru the second chamber behind the door, and second door ( in section Right off den of rancore )
I had found the offering with the hoard on my butt. Yelled for LS mates to meet me in the hallway, ran to them and escaped us. The NM fight to get the mitts ..piece of cake. the Offering is the insane part. GL. take a well versed RDM with you ( I was rdm/blm obviously )
but all the buffs will help in staying alive while some one runs around checking the spawns. Its not so bad honestly. Brute force tactic instead of sneaking around.