Seems some are confusing this and it's probably already been posted, but I'm posting the updated Renkei chart as posted on th e summoner forum.
http://www.ukg.pwp.blueyonder.co.uk/images/renkei.jpg for the Renkei Chart.
AVATAR SKILLCHAINS
SUNBURST
Sunburst > Claw = Detonation
Axe Kick > Sunburst = Compression
Sunburst > Poison Nails = Transfixon
Poison Nails > Sunburst = Compression
Rock Throw > Sunburst = Reverberation
SHELLCRUSHER
Shock Strike > Shellcrusher = Detonation
Rock Throw > Shellcrusher = Detonation
Shellcrusher > Rock Throw = Scission
EARTH CRUSHER
Earth Crusher > Claw = Detonation
Axe Kick > Earth Crusher = Impaction
Earth Crusher > Double Punch for Gravitation
STARBURST
Poison Nails > Star Burst = Compression
Star Burst > Poison Nails = Transfixion
Starburst > Claw = Detonation
Starburst > Tail Whip = Detonation
SERAPH STRIKE
Seraph Strike > Ifrit-Punch = Liquefaction
Ifrit-Punch > Seraph Strike = Fusion
Axe Kick > Seraph Strike = Impaction
HEAVY SWING
Ifrit-Punch > Heavy Swing = Fusion
Slap > Heavy Swing = Impaction
Poison Nails > Brainshaker= Reverberation
Rock Buster > Burning Strike = Impaction
Shock Strike > Claw = Detonation
Poison Nails > Moonlit Charge = Compression
Axe Kick > Barracuda Dive = Fragmentation
Vorpal Scythe > Double Slap = Distortion
Poison Nails > Viper Bite = Distortion
Poison Nails > Slice = Distortion
http://www.ukg.pwp.blueyonder.co.uk/images/renkei.jpg for the Renkei Chart.