Herald of Gales

The Herald of Gales starts the battle with multiple 6 stamina skeleton minions. Luckily he never spawns more, so when you defeat them the are gone for the rest of the battle. Stun the Herald of Gales by depleting his stamina to 0 either with exact number of attacks or a spell such as a portal or potato spell. Be aware his recovery from Stamina Stun is very quick, so be ready. Keep the boss stunlocked by backstabbing. Attack a farther 6 stamina shield skeleton in a different row and change the attacker to the Herald of Gales row on the way back. This will reset his stun from stamina depletion. Continue backstabbing the boss until all his minion's are defeated. If you need to knock back a minion, use a spell. Finally, when the boss is alone, keep lowering his max stamina by one by putting him in stamina lock and hitting him while stunned. If the boss is about to teleport, which is telegraphed by him lifting his sword, you can interrupt him by hitting him with a spell at that time. The Herald seems to move faster the less Stamina he has and when he is as 0 Stamina his is almost impossibly fast. Keep his stamina around 3 so his speed is manageable.