Mahgo Hydras are among the most fearsome monsters in Prophecies. In packs of more than two, they can use devastating Fire Magic spells to quickly wipe out a party that is not properly prepared. Unlike their brethren, Mahgo Hydras strike with fire damage in melee combat.
Mahgo Hydras use Glyph of Renewal, so expect them to recast spells quickly.
Despite being casters, hydras use melee attacks on close targets rather than the wand of a typical caster.
Players use four main techniques to avoid their massive AoE damage:
Keep the party moving and spread out, lest Meteor Showers pummel everyone at once.
Reduce or limit the amount of damage the hydras can deal out, using Protection Prayers such as Protective Spirit and Protective Bond.
Prevent their casting spells, using multiple interrupts (e.g. Complicate or Guilt) or spell-disabling skills (e.g. Power Block, which is particularly effective, since these hydras only cast Fire Magic).
Slow their rate of casting, especially using skills that apply the Dazed condition. (This also allows any attack to interrupt them.)