From The TimeSplitters Wiki

Wood Golem
Unlocked by	Challenge > Banana Chomp > Playing with Fire with Silver or Better
Species	Golem
Size	Large
Accuracy	7
Agility	3
Stamina	7
Fire Proof	N/A
Shock Proof	N/A
Default AI	4
Native TimeZone	1920
First Appearance	TS2 Story Mode
Relations	N/A
Games	TS2

Wood Golem appears to be a walking tree. He does not have any facial features.

TS1 Gesture	N/A	TSFP Gesture	N/A
TS2 Gallery	Around the Temple, the thirsty roots of trees have sucked up the blood from a thousand human sacrifices. The souls of these ancient victims now prowl the earth bound within gnarled skins of wood.	TSFP Gallery	N/A

1920 Aztec Ruins

The Wood Golem appears in the Aztec level of TimeSplitters 2. In the level they can only be killed by being set aflame from a flaming arrow from a crossbow, or just a flamethrower. This is because it is a wood golem and wood burns very quickly and effectively.