Runes of Magic US / AU

Pretty much all I ever use is housemaid buffs and food and vender pots lizard blood arcane or better, but never pot up like some guilds I see.
I siege because it's fun, not to maximize my kill count

Amplified Attack
Enhanced Grace of Life
Angel's Blessing
Embrace of the Water Spirit
Blessed Spring Water
Magic Barrier
all the priest/xxx combo fairies skills
Soul Bond

Savage Blessing
Awakening of the Wild
Dark Moon
Summer Banquet
Mysterious Grace

Informer
Quickness Aura

cost mems and gold, but not too much
Rhinoceros Blood
Secret Ritual Manual
War Insignia

housemaid potions
Potion: Scarlet Lovex2
Potion: Unbridled Enthusiasm
Potion: Clear Thought
Potion: Princely Look

housemaid food
your preferance on the attack power or damage ones.

guild buff towers
housemaid buffs
guild stable buff

check the festival, as sometimes there will be a helpful buff from one of the events.

Osha tends to invest HEAVILY in immunity candies & cakes... beware!

I'll not mention what camagic did above, but camagic also missed Mysterious Grace and Enhanced Briar Shield.

Soul bond is used quite often on players so they can res on spot.

Cheap:
Lizard Blood/Tiger Fury/Arcane Mystery
Blessing of the Flower God (would have had to have stocked up during spring event)
Grassland Mix (3 mems for 5 food)
P/M-Dmg Foods from mem vendor (same price I believe)
If you're melle Caviar Sandwiches from House Keeper
All Housekeeper Potions
Stable Buffs
Buff Tower Buffs
Lesser Mount Speed Potions

Expensive:
P/M-Dmg food produced by a cook
Hero Potions
Egg Rice Dumplings
Little Magic Biscuits (Makes you small)
Hot Stew
Rhino Blood/Secret Ritual Manual/War Insignia
Mount Speed Potions

Really Expensive(though can be cheap depending on the sale etc):
Big Angel Sigh
Pheonix's Redemption
Universal Potions

+1 to kafkai

also any class combo specific skill. I did not put those as one should be familiar with them already.
If I missed any group buffs, plz add. thx.

also check the festival for buff foods, potions, desserts.