tern ▁who ▁la cks ▁medical ▁expert ise . ▁When ▁Hal ▁Jordan ▁breaks ▁his ▁arm , ▁the ▁best ▁he ▁can ▁do ▁is ▁conj ure ▁up ▁a ▁cast . ▁This ▁is ▁further ▁extended ▁into ▁an ▁ability ▁to ▁replace ▁large ▁sections ▁of ▁one ' s ▁injured ▁body ▁with ▁construct s , ▁but ▁this ▁too ▁requires ▁detailed ▁bi ological ▁knowledge ▁of ▁one ' s ▁body ▁and ▁concentration ▁enough ▁to ▁prolong ▁the ▁construct . ▁ ▁Alan ▁Scott ' s ▁ring ▁is ▁unable ▁to ▁directly ▁affect ▁anything ▁made ▁of ▁wood . ▁Alan ▁can ▁conj ure ▁a ▁green ▁shield ▁to ▁block ▁bul lets , ▁but ▁a ▁wooden ▁club ▁will ▁pass ▁through ▁it ▁effort lessly . ▁ ▁The ▁rings ▁of ▁Hal ▁Jordan ▁and ▁his ▁colle agues ▁originally ▁shared ▁a ▁similar ▁weak ness ▁to ▁anything ▁colored ▁yellow , ▁though ▁due ▁to ▁the ▁removal ▁of ▁the ▁yellow ▁imp urity ▁from ▁the ▁Central ▁B atter y ▁on ▁O a , ▁more ▁recent ▁stories ▁have ▁removed ▁this ▁weak ness . ▁ ▁The ▁effect iveness ▁of ▁the ▁ring ▁is ▁tied ▁to ▁the ▁wear er ' s ▁will power . ▁A ▁Green ▁Lan tern ▁with ▁strong ▁will power ▁will ▁beat ▁a ▁we aker - w illed ▁Lan tern ▁in ▁a ▁du el . ▁ ▁An yth ing ▁which ▁weak ens ▁the ▁Green ▁Lan tern ' s ▁mind , ▁such ▁as ▁a ▁tele path ic ▁attack , ▁may ▁render ▁his ▁ring ▁useless . ▁ ▁Green ▁Lan tern ▁O ath ▁Green ▁Lan tern ▁is ▁famous ▁for ▁the ▁o ath ▁he ▁rec ites ▁when ▁he ▁charges ▁his ▁ring . ▁Origin