New mount: STAG

The stag is quick on land and able to do quick jumps over small obstructions, if trained well, it can bounce off walls to climb high cliffs.

• endurance: 3 slots (like jackal)
• land speed: similar to jackal, or slightly faster.
• main skill: dash-jump: works as a middle ground between springer high jump (without mastery) and raptor forward dash (without mastery)
• Special skill: jump-bounce: Jump and bounce off a vertical surface going higher and in the opposite direction. Works as a double jump if you hit a wall.
• Mastery unlock: triple jump: when using a jump or jump-bounce, build up momentum. In the third jump (or jump-bounce), release your momentum to jump higher, faster and further than normal. (if you jump 3 times in quick succession you go faster, higher and further)

Could be a nice option from the spider/gecko that can walk on vertical surfaces

That sounds like it could be a lot of fun!