As far as I know a warden marks his/her enemies in order to exploit Warden's Fury and Warden's Grasp immediate at-wills. But in Primal Power, page 95, Daily Evocations lvl 5, Lifebind Attack states:
Effect: While the target is marked by you, its penalty to attack rolls for the marked condition is -5 instead of -2.
Is there something I'm missing? Where is it stated that warden's mark acts the same as fighter's?