There's a bunch of buff stacking issues you need to learn.
Strength of Nature: Overwrites Grim Aura. Overwritten by monk epic. Blocked by Divine Strength. It's good on rogues. Not monks.
Call of Earth: Blocked by Coldain rings 8 through 10. Has stacking issues with Speed of the Shissar (Enc Epic). Stacks with DS and coat buffs. Doesn't stack with DS potion.
Call of the Predator: I think this stacks with everything, thankfully. Good for monks / rogues.
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