Prosh

Strategy
Prosh is found in Dread Citadel in Stygaea. There are multiple Prosh in this location. Prosh doesn't do much damage same with the other small hostile guards roaming the area so your only worry would be players. Since Stygaea is a PvP area, the only obstacle would be other players hunting this area since Oruun and Alpha Nalrys spawn here as well.

How to Tame
Prosh, like most elites, require a mark before taming. You would need to have a Prosh Mark in your inventory in order to attempt to tame. You would also need to lower it's health around 30% before you can attempt to tame.

Sealing Details
Seal stones are items that allow you to seal tamed familiars in order to either socket them into your gear for bonus stats or used to give talent points. When you seal this mount away with a seal stone in order to use it on equipment enhancing, you get these stats: