The Harrowhd -

Harrow is a "kill-to-support" frame. If you have teammates that "nuke" entire rooms instantly (like Saryn or Mesa), you may find it difficult to trigger your energy and health regen buffs. Coordinate with your team to ensure you can land the final blows needed to keep the squad's energy bars full. Harrow: Making him a proper support - Warframe Forums

: This ability provides a brief window of total invulnerability . After the window ends, the damage absorbed is converted into a flat Critical Chance buff for the entire team. Building for "HD" Performance The HarrowHD

: Directly increases the amount of energy gained per kill and the speed of your buffs. Harrow is a "kill-to-support" frame

: Cast this to chain enemies in place. This provides instant Overshields for Harrow and creates easy targets for headshots. Harrow: Making him a proper support - Warframe