1. Any Level 50 Elemental AoE
2. Heal Other > 50
3. One Two Handed Weapon > 75
4. Witch's Brew
5. Sacrifice

Hymn of Might/Vigor is like gravy on top. If you have all of the above abilities then you will be effective in playing a support role. If you wish to advance your support might, then you should continue to focus on self buff/other buff and debuffing. If your going to try and be a debuffer then your going to need Necromancy > 40 as well for the indirect HP debuff and debuff by weapon type to add insult to injury.

Don't make me have'ta Troll ya Bro!