A combustor (10,80), comprising: a. an end cap (28,86) that extends radially across at least a portion of the combustor (10,80), wherein the end cap (28,86) comprises an upstream surface (36,90) axially separated from a downstream surface (38,92) and a cap shield circumferentially (40,96) surrounding the upstream (36,90) and downstream surfaces (38,92); b. a first set of premixer tubes extending (24,88) from the upstream surface (36,90) through the downstream surface (38,92) to provide fluid communication through the end cap (28,86); c. a first fuel (50,110) conduit in fluid communication with the first set of premixer tubes (24,88) to supply fuel to the first set of premixer tubes (24,88); d. a second set of premixer tubes (24,88) extending from the upstream surface (36,90) through the downstream surface (38,92) to provide fluid communication through the end cap (28,86); e. a casing (12,82) circumferentially surrounding at least a portion of the cap shield (40,96) to define an annular passage (44,98) between the cap shield (40,96) and the casing (12,82); f. a second fuel conduit (52,112) in fluid communication with the second set of premixer tubes (24,88) to supply fuel through the annular passage (44,98) to the second set of premixer tubes (24,88); g. a barrier disposed between the upstream (36,90) and downstream (38,92) surfaces, wherein the barrier at least partially defines a fuel plenum (46,48,106,108) and an air plenum inside the end cap (28,86); and h. an axial baffle (30,100) disposed within the end cap separating the first set of premixer tubes from the second set of premixer tubes. a. an end cap (28,86) that extends radially across at least a portion of the combustor (10,80), wherein the end cap (28,86) comprises an upstream surface (36,90) axially separated from a downstream surface (38,92) and a cap shield circumferentially (40,96) surrounding the upstream (36,90) and downstream surfaces (38,92); b. a first set of premixer tubes extending (24,88) from the upstream surface (36,90) through the downstream surface (38,92) to provide fluid communication through the end cap (28,86); c. a first fuel (50,110) conduit in fluid communication with the first set of premixer tubes (24,88) to supply fuel to the first set of premixer tubes (24,88); d. a second set of premixer tubes (24,88) extending from the upstream surface (36,90) through the downstream surface (38,92) to provide fluid communication through the end cap (28,86); e. a casing (12,82) circumferentially surrounding at least a portion of the cap shield (40,96) to define an annular passage (44,98) between the cap shield (40,96) and the casing (12,82); f. a second fuel conduit (52,112) in fluid communication with the second set of premixer tubes (24,88) to supply fuel through the annular passage (44,98) to the second set of premixer tubes (24,88); g. a barrier disposed between the upstream (36,90) and downstream (38,92) surfaces, wherein the barrier at least partially defines a fuel plenum (46,48,106,108) and an air plenum inside the end cap (28,86); and h. an axial baffle (30,100) disposed within the end cap separating the first set of premixer tubes from the second set of premixer tubes.